33 files changed, 18079 insertions, 0 deletions
diff --git a/src/engine/ai/attacks.asm b/src/engine/ai/attacks.asm
new file mode 100644
index 0000000..9f93c33
--- /dev/null
+++ b/src/engine/ai/attacks.asm
@@ -0,0 +1,721 @@
+; have AI choose an attack to use, but do not execute it.
+; return carry if an attack is chosen.
+AIProcessButDontUseAttack: ; 169ca (5:69ca)
+	ld a, $01
+	ld [wAIExecuteProcessedAttack], a
+
+; backup wPlayAreaAIScore in wTempPlayAreaAIScore.
+	ld de, wTempPlayAreaAIScore
+	ld hl, wPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+
+; copies wAIScore to wTempAIScore
+	ld a, [wAIScore]
+	ld [de], a
+	jr AIProcessAttacks
+
+; copies wTempPlayAreaAIScore to wPlayAreaAIScore
+; and loads wAIScore with value in wTempAIScore.
+; identical to RetrievePlayAreaAIScoreFromBackup1.
+RetrievePlayAreaAIScoreFromBackup2: ; 169e3 (5:69e3)
+	push af
+	ld de, wPlayAreaAIScore
+	ld hl, wTempPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+
+	ld a, [hl]
+	ld [wAIScore], a
+	pop af
+	ret
+
+; have AI choose and execute an attack.
+; return carry if an attack was chosen and attempted.
+AIProcessAndTryToUseAttack: ; 169f8 (5:69f8)
+	xor a
+	ld [wAIExecuteProcessedAttack], a
+	; fallthrough
+
+; checks which of the Active card's attacks for AI to use.
+; If any of the attacks has enough AI score to be used,
+; AI will use it if wAIExecuteProcessedAttack is 0.
+; in either case, return carry if an attack is chosen to be used.
+AIProcessAttacks: ; 169fc (5:69fc)
+; if AI used Pluspower, load its attack index
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PLUSPOWER
+	jr z, .no_pluspower
+	ld a, [wAIPluspowerAttack]
+	ld [wSelectedAttack], a
+	jr .attack_chosen
+
+.no_pluspower
+; if Player is running Mewtwo1 mill deck,
+; skip attack if Barrier counter is 0.
+	ld a, [wAIBarrierFlagCounter]
+	cp AI_MEWTWO_MILL + 0
+	jp z, .dont_attack
+
+; determine AI score of both attacks.
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	call GetAIScoreOfAttack
+	ld a, [wAIScore]
+	ld [wFirstAttackAIScore], a
+	ld a, SECOND_ATTACK
+	call GetAIScoreOfAttack
+
+; compare both attack scores
+	ld c, SECOND_ATTACK
+	ld a, [wFirstAttackAIScore]
+	ld b, a
+	ld a, [wAIScore]
+	cp b
+	jr nc, .check_score
+	; first attack has higher score
+	dec c
+	ld a, b
+
+; c holds the attack index chosen by AI,
+; and a holds its AI score.
+; first check if chosen attack has at least minimum score.
+; then check if first attack is better than second attack
+; in case the second one was chosen.
+.check_score
+	cp $50 ; minimum score to use attack
+	jr c, .dont_attack
+	; enough score, proceed
+
+	ld a, c
+	ld [wSelectedAttack], a
+	or a
+	jr z, .attack_chosen
+	call CheckWhetherToSwitchToFirstAttack
+
+.attack_chosen
+; check whether to execute the attack chosen
+	ld a, [wAIExecuteProcessedAttack]
+	or a
+	jr z, .execute
+
+; set carry and reset Play Area AI score
+; to the previous values.
+	scf
+	jp RetrievePlayAreaAIScoreFromBackup2
+
+.execute
+	ld a, AI_TRAINER_CARD_PHASE_14
+	call AIProcessHandTrainerCards
+
+; load this attack's damage output against
+; the current Defending Pokemon.
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+
+	or a
+	jr z, .check_damage_bench
+	; if damage is not 0, fallthrough
+
+.can_damage
+	xor a
+	ld [wcdb4], a
+	jr .use_attack
+
+.check_damage_bench
+; check if it can otherwise damage player's bench
+	ld a, ATTACK_FLAG1_ADDRESS | DAMAGE_TO_OPPONENT_BENCH_F
+	call CheckLoadedAttackFlag
+	jr c, .can_damage
+
+; cannot damage either Defending Pokemon or Bench
+	ld hl, wcdb4
+	inc [hl]
+
+; return carry if attack is chosen
+; and AI tries to use it.
+.use_attack
+	ld a, $01
+	ld [wcddb], a
+	call AITryUseAttack
+	scf
+	ret
+
+.dont_attack
+	ld a, [wAIExecuteProcessedAttack]
+	or a
+	jr z, .failed_to_use
+
+; reset Play Area AI score
+; to the previous values.
+	jp RetrievePlayAreaAIScoreFromBackup2
+
+; return no carry if no viable attack.
+.failed_to_use
+	ld hl, wcdb4
+	inc [hl]
+	or a
+	ret
+
+; determines the AI score of attack index in a
+; of card in Play Area location hTempPlayAreaLocation_ff9d.
+GetAIScoreOfAttack: ; 16a86 (5:6a86)
+; initialize AI score.
+	ld [wSelectedAttack], a
+	ld a, $50
+	ld [wAIScore], a
+
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfSelectedAttackIsUnusable
+	jr nc, .usable
+
+; return zero AI score.
+.unusable
+	xor a
+	ld [wAIScore], a
+	jp .done
+
+; load arena card IDs
+.usable
+	xor a
+	ld [wAICannotDamage], a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempTurnDuelistCardID], a
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempNonTurnDuelistCardID], a
+
+; handle the case where the player has No Damage substatus.
+; in the case the player does, check if this attack
+; has a residual effect, or if it can damage the opposing bench.
+; If none of those are true, render the attack unusable.
+; also if it's a PKMN power, consider it unusable as well.
+	bank1call HandleNoDamageOrEffectSubstatus
+	call SwapTurn
+	jr nc, .check_if_can_ko
+
+	; player is under No Damage substatus
+	ld a, $01
+	ld [wAICannotDamage], a
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr z, .unusable
+	and RESIDUAL
+	jr nz, .check_if_can_ko
+	ld a, ATTACK_FLAG1_ADDRESS | DAMAGE_TO_OPPONENT_BENCH_F
+	call CheckLoadedAttackFlag
+	jr nc, .unusable
+
+; calculate damage to player to check if attack can KO.
+; encourage attack if it's able to KO.
+.check_if_can_ko
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jr c, .can_ko
+	jr z, .can_ko
+	jr .check_damage
+.can_ko
+	ld a, 20
+	call AddToAIScore
+
+; raise AI score by the number of damage counters that this attack deals.
+; if no damage is dealt, subtract AI score. in case wDamage is zero
+; but wMaxDamage is not, then encourage attack afterwards.
+; otherwise, if wMaxDamage is also zero, check for damage against
+; player's bench, and encourage attack in case there is.
+.check_damage
+	xor a
+	ld [wAIAttackIsNonDamaging], a
+	ld a, [wDamage]
+	ld [wTempAI], a
+	or a
+	jr z, .no_damage
+	call CalculateByteTensDigit
+	call AddToAIScore
+	jr .check_recoil
+.no_damage
+	ld a, $01
+	ld [wAIAttackIsNonDamaging], a
+	call SubFromAIScore
+	ld a, [wAIMaxDamage]
+	or a
+	jr z, .no_max_damage
+	ld a, 2
+	call AddToAIScore
+	xor a
+	ld [wAIAttackIsNonDamaging], a
+.no_max_damage
+	ld a, ATTACK_FLAG1_ADDRESS | DAMAGE_TO_OPPONENT_BENCH_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_recoil
+	ld a, 2
+	call AddToAIScore
+
+; handle recoil attacks (low and high recoil).
+.check_recoil
+	ld a, ATTACK_FLAG1_ADDRESS | LOW_RECOIL_F
+	call CheckLoadedAttackFlag
+	jr c, .is_recoil
+	ld a, ATTACK_FLAG1_ADDRESS | HIGH_RECOIL_F
+	call CheckLoadedAttackFlag
+	jp nc, .check_defending_can_ko
+.is_recoil
+	; sub from AI score number of damage counters
+	; that attack deals to itself.
+	ld a, [wLoadedAttackEffectParam]
+	or a
+	jp z, .check_defending_can_ko
+	ld [wDamage], a
+	call ApplyDamageModifiers_DamageToSelf
+	ld a, e
+	call CalculateByteTensDigit
+	call SubFromAIScore
+
+	push de
+	ld a, ATTACK_FLAG1_ADDRESS | HIGH_RECOIL_F
+	call CheckLoadedAttackFlag
+	pop de
+	jr c, .high_recoil
+
+	; if LOW_RECOIL KOs self, decrease AI score
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	cp e
+	jr c, .kos_self
+	jp nz, .check_defending_can_ko
+.kos_self
+	ld a, 10
+	call SubFromAIScore
+
+.high_recoil
+	; dismiss this attack if no benched Pokémon
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 2
+	jr c, .dismiss_high_recoil_atk
+	; has benched Pokémon
+
+; here the AI handles high recoil attacks differently
+; depending on what deck it's playing.
+	ld a, [wOpponentDeckID]
+	cp ROCK_CRUSHER_DECK_ID
+	jr z, .rock_crusher_deck
+	cp ZAPPING_SELFDESTRUCT_DECK_ID
+	jr z, .zapping_selfdestruct_deck
+	cp BOOM_BOOM_SELFDESTRUCT_DECK_ID
+	jr z, .encourage_high_recoil_atk
+	; Boom Boom Selfdestruct deck always encourages
+	cp POWER_GENERATOR_DECK_ID
+	jr nz, .high_recoil_generic_checks
+	; Power Generator deck always dismisses
+
+.dismiss_high_recoil_atk
+	xor a
+	ld [wAIScore], a
+	jp .done
+
+.encourage_high_recoil_atk
+	ld a, 20
+	call AddToAIScore
+	jp .done
+
+; Zapping Selfdestruct deck only uses this attack
+; if number of cards in deck >= 30 and
+; HP of active card is < half max HP.
+.zapping_selfdestruct_deck
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp 31
+	jr nc, .high_recoil_generic_checks
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	sla a
+	cp c
+	jr c, .high_recoil_generic_checks
+	ld b, 0
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp MAGNEMITE1
+	jr z, .magnemite1
+	ld b, 10 ; bench damage
+.magnemite1
+	ld a, 10
+	add b
+	ld b, a ; 20 bench damage if not Magnemite1
+
+; if this attack causes player to win the duel by
+; knocking out own Pokémon, dismiss attack.
+	ld a, 1 ; count active Pokémon as KO'd
+	call .check_if_kos_bench
+	jr c, .dismiss_high_recoil_atk
+	jr .encourage_high_recoil_atk
+
+; Rock Crusher Deck only uses this attack if
+; prize count is below 4 and attack wins (or potentially draws) the duel,
+; (i.e. at least gets KOs equal to prize cards left).
+.rock_crusher_deck
+	call CountPrizes
+	cp 4
+	jr nc, .dismiss_high_recoil_atk
+	; prize count < 4
+	ld b, 20 ; damage dealt to bench
+	call SwapTurn
+	xor a
+	call .check_if_kos_bench
+	call SwapTurn
+	jr c, .encourage_high_recoil_atk
+
+; generic checks for all other deck IDs.
+; encourage attack if it wins (or potentially draws) the duel,
+; (i.e. at least gets KOs equal to prize cards left).
+; dismiss it if it causes the player to win.
+.high_recoil_generic_checks
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp CHANSEY
+	jr z, .chansey
+	cp MAGNEMITE1
+	jr z, .magnemite1_or_weezing
+	cp WEEZING
+	jr z, .magnemite1_or_weezing
+	ld b, 20 ; bench damage
+	jr .check_bench_kos
+.magnemite1_or_weezing
+	ld b, 10 ; bench damage
+	jr .check_bench_kos
+.chansey
+	ld b, 0 ; no bench damage
+
+.check_bench_kos
+	push bc
+	call SwapTurn
+	xor a
+	call .check_if_kos_bench
+	call SwapTurn
+	pop bc
+	jr c, .wins_the_duel
+	push de
+	ld a, 1
+	call .check_if_kos_bench
+	pop bc
+	jr nc, .count_own_ko_bench
+
+; attack causes player to draw all prize cards
+	xor a
+	ld [wAIScore], a
+	jp .done
+
+; attack causes CPU to draw all prize cards
+.wins_the_duel
+	ld a, 20
+	call AddToAIScore
+	jp .done
+
+; subtract from AI score number of own benched Pokémon KO'd
+.count_own_ko_bench
+	push bc
+	ld a, d
+	or a
+	jr z, .count_player_ko_bench
+	dec a
+	call SubFromAIScore
+
+; add to AI score number of player benched Pokémon KO'd
+.count_player_ko_bench
+	pop bc
+	ld a, b
+	call AddToAIScore
+	jr .check_defending_can_ko
+
+; local function that gets called to determine damage to
+; benched Pokémon caused by a HIGH_RECOIL attack.
+; return carry if using attack causes number of benched Pokémon KOs
+; equal to or larger than remaining prize cards.
+; this function is independent on duelist turn, so whatever
+; turn it is when this is called, it's that duelist's
+; bench/prize cards that get checked.
+; input:
+;	a = initial number of KO's beside benched Pokémon,
+;		so that if the active Pokémon is KO'd by the attack,
+;		this counts towards the prize cards collected
+;	b = damage dealt to bench Pokémon
+.check_if_kos_bench
+	ld d, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld e, PLAY_AREA_ARENA
+.loop
+	inc e
+	ld a, [hli]
+	cp $ff
+	jr z, .exit_loop
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	push hl
+	call GetTurnDuelistVariable
+	pop hl
+	cp b
+	jr z, .increase_count
+	jr nc, .loop
+.increase_count
+	; increase d if damage dealt KOs
+	inc d
+	jr .loop
+.exit_loop
+	push de
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	pop de
+	cp d
+	jp c, .set_carry
+	jp z, .set_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; if defending card can KO, encourage attack
+; unless attack is non-damaging.
+.check_defending_can_ko
+	ld a, [wSelectedAttack]
+	push af
+	call CheckIfDefendingPokemonCanKnockOut
+	pop bc
+	ld a, b
+	ld [wSelectedAttack], a
+	jr nc, .check_discard
+	ld a, 5
+	call AddToAIScore
+	ld a, [wAIAttackIsNonDamaging]
+	or a
+	jr z, .check_discard
+	ld a, 5
+	call SubFromAIScore
+
+; subtract from AI score if this attack requires
+; discarding any energy cards.
+.check_discard
+	ld a, [wSelectedAttack]
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, ATTACK_FLAG2_ADDRESS | DISCARD_ENERGY_F
+	call CheckLoadedAttackFlag
+	jr nc, .asm_16ca6
+	ld a, 1
+	call SubFromAIScore
+	ld a, [wLoadedAttackEffectParam]
+	call SubFromAIScore
+
+.asm_16ca6
+	ld a, ATTACK_FLAG2_ADDRESS | FLAG_2_BIT_6_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_nullify_flag
+	ld a, [wLoadedAttackEffectParam]
+	call AddToAIScore
+
+; encourage attack if it has a nullify or weaken attack effect.
+.check_nullify_flag
+	ld a, ATTACK_FLAG2_ADDRESS | NULLIFY_OR_WEAKEN_ATTACK_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_draw_flag
+	ld a, 1
+	call AddToAIScore
+
+; encourage attack if it has an effect to draw a card.
+.check_draw_flag
+	ld a, ATTACK_FLAG1_ADDRESS | DRAW_CARD_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_heal_flag
+	ld a, 1
+	call AddToAIScore
+
+.check_heal_flag
+	ld a, ATTACK_FLAG2_ADDRESS | HEAL_USER_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_status_effect
+	ld a, [wLoadedAttackEffectParam]
+	cp 1
+	jr z, .tally_heal_score
+	ld a, [wTempAI]
+	call CalculateByteTensDigit
+	ld b, a
+	ld a, [wLoadedAttackEffectParam]
+	cp 3
+	jr z, .asm_16cec
+	srl b
+	jr nc, .asm_16cec
+	inc b
+.asm_16cec
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	call CalculateByteTensDigit
+	cp b
+	jr c, .tally_heal_score
+	ld a, b
+.tally_heal_score
+	push af
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	call CalculateByteTensDigit
+	pop bc
+	cp b ; wLoadedAttackEffectParam
+	jr c, .add_heal_score
+	ld a, b
+.add_heal_score
+	call AddToAIScore
+
+.check_status_effect
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	; skip if player has Snorlax
+	cp SNORLAX
+	jp z, .handle_special_atks
+
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetNonTurnDuelistVariable
+	ld [wTempAI], a
+
+; encourage a poison inflicting attack if opposing Pokémon
+; isn't (doubly) poisoned already.
+; if opposing Pokémon is only poisoned and not double poisoned,
+; and this attack has FLAG_2_BIT_6 set, discourage it
+; (possibly to make Nidoking's Toxic attack less likely to be chosen
+; if the other Pokémon is poisoned.)
+	ld a, ATTACK_FLAG1_ADDRESS | INFLICT_POISON_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_sleep
+	ld a, [wTempAI]
+	and DOUBLE_POISONED
+	jr z, .add_poison_score
+	and $40 ; only double poisoned?
+	jr z, .check_sleep
+	ld a, ATTACK_FLAG2_ADDRESS | FLAG_2_BIT_6_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_sleep
+	ld a, 2
+	call SubFromAIScore
+	jr .check_sleep
+.add_poison_score
+	ld a, 2
+	call AddToAIScore
+
+; encourage sleep-inducing attack if other Pokémon isn't asleep.
+.check_sleep
+	ld a, ATTACK_FLAG1_ADDRESS | INFLICT_SLEEP_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_paralysis
+	ld a, [wTempAI]
+	and CNF_SLP_PRZ
+	cp ASLEEP
+	jr z, .check_paralysis
+	ld a, 1
+	call AddToAIScore
+
+; encourage paralysis-inducing attack if other Pokémon isn't asleep.
+; otherwise, if other Pokémon is asleep, discourage attack.
+.check_paralysis
+	ld a, ATTACK_FLAG1_ADDRESS | INFLICT_PARALYSIS_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_confusion
+	ld a, [wTempAI]
+	and CNF_SLP_PRZ
+	cp ASLEEP
+	jr z, .sub_prz_score
+	ld a, 1
+	call AddToAIScore
+	jr .check_confusion
+.sub_prz_score
+	ld a, 1
+	call SubFromAIScore
+
+; encourage confuse-inducing attack if other Pokémon isn't asleep
+; or confused already.
+; otherwise, if other Pokémon is asleep or confused,
+; discourage attack instead.
+.check_confusion
+	ld a, ATTACK_FLAG1_ADDRESS | INFLICT_CONFUSION_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_if_confused
+	ld a, [wTempAI]
+	and CNF_SLP_PRZ
+	cp ASLEEP
+	jr z, .sub_cnf_score
+	ld a, [wTempAI]
+	and CNF_SLP_PRZ
+	cp CONFUSED
+	jr z, .check_if_confused
+	ld a, 1
+	call AddToAIScore
+	jr .check_if_confused
+.sub_cnf_score
+	ld a, 1
+	call SubFromAIScore
+
+; if this Pokémon is confused, subtract from score.
+.check_if_confused
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	cp CONFUSED
+	jr nz, .handle_special_atks
+	ld a, 1
+	call SubFromAIScore
+
+; SPECIAL_AI_HANDLING marks attacks that the AI handles individually.
+; each attack has its own checks and modifies AI score accordingly.
+.handle_special_atks
+	ld a, ATTACK_FLAG3_ADDRESS | SPECIAL_AI_HANDLING_F
+	call CheckLoadedAttackFlag
+	jr nc, .done
+	call HandleSpecialAIAttacks
+	cp $80
+	jr c, .negative_score
+	sub $80
+	call AddToAIScore
+	jr .done
+.negative_score
+	ld b, a
+	ld a, $80
+	sub b
+	call SubFromAIScore
+
+.done
+	ret
diff --git a/src/engine/ai/boss_deck_set_up.asm b/src/engine/ai/boss_deck_set_up.asm
new file mode 100644
index 0000000..fa3a262
--- /dev/null
+++ b/src/engine/ai/boss_deck_set_up.asm
@@ -0,0 +1,167 @@
+; sets up the initial hand of boss deck.
+; always draws at least 2 Basic Pokemon cards and 2 Energy cards.
+; also sets up so that the next cards to be drawn have
+; some minimum number of Basic Pokemon and Energy cards.
+SetUpBossStartingHandAndDeck: ; 172af (5:72af)
+; shuffle all hand cards in deck
+	ld a, DUELVARS_HAND
+	call GetTurnDuelistVariable
+	ld b, STARTING_HAND_SIZE
+.loop_hand
+	ld a, [hl]
+	call RemoveCardFromHand
+	call ReturnCardToDeck
+	dec b
+	jr nz, .loop_hand
+	jr .count_energy_basic
+
+.shuffle_deck
+	call ShuffleDeck
+
+; count number of Energy and basic Pokemon cards
+; in the first STARTING_HAND_SIZE in deck.
+.count_energy_basic
+	xor a
+	ld [wce06], a
+	ld [wce08], a
+
+	ld a, DUELVARS_DECK_CARDS
+	call GetTurnDuelistVariable
+	ld b, STARTING_HAND_SIZE
+.loop_deck_1
+	ld a, [hli]
+	push bc
+	call LoadCardDataToBuffer1_FromDeckIndex
+	pop bc
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr c, .pokemon_card_1
+	cp TYPE_TRAINER
+	jr z, .next_card_deck_1
+
+; energy card
+	ld a, [wce08]
+	inc a
+	ld [wce08], a
+	jr .next_card_deck_1
+
+.pokemon_card_1
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .next_card_deck_1 ; not basic
+	ld a, [wce06]
+	inc a
+	ld [wce06], a
+
+.next_card_deck_1
+	dec b
+	jr nz, .loop_deck_1
+
+; tally the number of Energy and basic Pokemon cards
+; and if any of them is smaller than 2, re-shuffle deck.
+	ld a, [wce06]
+	cp 2
+	jr c, .shuffle_deck
+	ld a, [wce08]
+	cp 2
+	jr c, .shuffle_deck
+
+; now check the following 6 cards (prize cards).
+; re-shuffle deck if any of these cards is listed in wAICardListAvoidPrize.
+	ld b, 6
+.check_card_ids
+	ld a, [hli]
+	push bc
+	call .CheckIfIDIsInList
+	pop bc
+	jr c, .shuffle_deck
+	dec b
+	jr nz, .check_card_ids
+
+; finally, check 6 cards after that.
+; if Energy or Basic Pokemon counter is below 4
+; (counting with the ones found in the initial hand)
+; then re-shuffle deck.
+	ld b, 6
+.loop_deck_2
+	ld a, [hli]
+	push bc
+	call LoadCardDataToBuffer1_FromDeckIndex
+	pop bc
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr c, .pokemon_card_2
+	cp TYPE_TRAINER
+	jr z, .next_card_deck_2
+
+; energy card
+	ld a, [wce08]
+	inc a
+	ld [wce08], a
+	jr .next_card_deck_2
+
+.pokemon_card_2
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .next_card_deck_2
+	ld a, [wce06]
+	inc a
+	ld [wce06], a
+
+.next_card_deck_2
+	dec b
+	jr nz, .loop_deck_2
+
+	ld a, [wce06]
+	cp 4
+	jp c, .shuffle_deck
+	ld a, [wce08]
+	cp 4
+	jp c, .shuffle_deck
+
+; draw new set of hand cards
+	ld a, DUELVARS_DECK_CARDS
+	call GetTurnDuelistVariable
+	ld b, STARTING_HAND_SIZE
+.draw_loop
+	ld a, [hli]
+	call SearchCardInDeckAndAddToHand
+	call AddCardToHand
+	dec b
+	jr nz, .draw_loop
+	ret
+
+; expectation: return carry if card ID corresponding
+; to the input deck index is listed in wAICardListAvoidPrize;
+; reality: always returns no carry because when checking terminating
+; byte in wAICardListAvoidPrize ($00), it wrongfully uses 'cp a' instead of 'or a',
+; so it always ends up returning in the first item in list.
+; input:
+;	- a = deck index of card to check
+.CheckIfIDIsInList ; 17366 (5:7366)
+	ld b, a
+	ld a, [wAICardListAvoidPrize + 1]
+	or a
+	ret z ; null
+	push hl
+	ld h, a
+	ld a, [wAICardListAvoidPrize]
+	ld l, a
+
+	ld a, b
+	call GetCardIDFromDeckIndex
+.loop_id_list
+	ld a, [hli]
+	cp a ; bug, should be 'or a'
+	jr z, .false
+	cp e
+	jr nz, .loop_id_list
+
+; true
+	pop hl
+	scf
+	ret
+.false
+	pop hl
+	or a
+	ret
diff --git a/src/engine/ai/common.asm b/src/engine/ai/common.asm
new file mode 100644
index 0000000..d4f1da4
--- /dev/null
+++ b/src/engine/ai/common.asm
@@ -0,0 +1,970 @@
+; runs through Player's whole deck and
+; sets carry if there's any Pokemon other
+; than Mewtwo1.
+CheckIfPlayerHasPokemonOtherThanMewtwo1: ; 227a9 (8:67a9)
+	call SwapTurn
+	ld e, 0
+.loop_deck
+	ld a, e
+	push de
+	call LoadCardDataToBuffer2_FromDeckIndex
+	pop de
+	ld a, [wLoadedCard2Type]
+	cp TYPE_ENERGY
+	jp nc, .next ; can be a jr
+	ld a, [wLoadedCard2ID]
+	cp MEWTWO1
+	jr nz, .not_mewtwo1
+.next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop_deck
+
+; no carry
+	call SwapTurn
+	or a
+	ret
+
+.not_mewtwo1
+	call SwapTurn
+	scf
+	ret
+
+; returns no carry if, given the Player is using a Mewtwo1 mill deck,
+; the AI already has a Bench fully set up, in which case it
+; will process some Trainer cards in hand (namely Energy Removals).
+; this is used to check whether to skip some normal AI routines
+; this turn and jump right to the attacking phase.
+HandleAIAntiMewtwoDeckStrategy: ; 227d3 (8:67d3)
+; return carry if Player is not playing Mewtwo1 mill deck
+	ld a, [wAIBarrierFlagCounter]
+	bit AI_MEWTWO_MILL_F, a
+	jr z, .set_carry
+
+; else, check if there's been less than 2 turns
+; without the Player using Barrier.
+	cp AI_MEWTWO_MILL + 2
+	jr c, .count_bench
+
+; if there has been, reset wAIBarrierFlagCounter
+; and return carry.
+	xor a
+	ld [wAIBarrierFlagCounter], a
+	jr .set_carry
+
+; else, check number of Pokemon that are set up in Bench
+; if less than 4, return carry.
+.count_bench
+	farcall CountNumberOfSetUpBenchPokemon
+	cp 4
+	jr c, .set_carry
+
+; if there's at least 4 Pokemon in the Bench set up,
+; process Trainer hand cards of AI_TRAINER_CARD_PHASE_05
+	ld a, AI_TRAINER_CARD_PHASE_05
+	farcall AIProcessHandTrainerCards
+	or a
+	ret
+
+.set_carry
+	scf
+	ret
+
+; lists in wDuelTempList all the basic energy cards
+; in card location of a.
+; outputs in a number of cards found.
+; returns carry if none were found.
+; input:
+;   a = CARD_LOCATION_* to look
+; output:
+;   a = number of cards found
+FindBasicEnergyCardsInLocation: ; 227f6 (8:67f6)
+	ld [wTempAI], a
+	lb de, 0, 0
+	ld hl, wDuelTempList
+
+; d = number of basic energy cards found
+; e = current card in deck
+; loop entire deck
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	push hl
+	call GetTurnDuelistVariable
+	ld hl, wTempAI
+	cp [hl]
+	pop hl
+	jr nz, .next_card
+
+; is in the card location we're looking for
+	ld a, e
+	push de
+	push hl
+	call GetCardIDFromDeckIndex
+	pop hl
+	ld a, e
+	pop de
+	cp DOUBLE_COLORLESS_ENERGY
+	; only basic energy cards
+	; will set carry here
+	jr nc, .next_card
+
+; is a basic energy card
+; add this card to the TempList
+	ld a, e
+	ld [hli], a
+	inc d
+.next_card
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop
+
+; check if any were found
+	ld a, d
+	or a
+	jr z, .set_carry
+
+; some were found, add the termination byte on TempList
+	ld a, $ff
+	ld [hl], a
+	ld a, d
+	ret
+
+.set_carry
+	scf
+	ret
+
+; returns in a the card index of energy card
+; attached to Pokémon in Play Area location a,
+; that is to be discarded by the AI for an effect.
+; outputs $ff is none was found.
+; input:
+;	a = PLAY_AREA_* constant of card
+; output:
+;	a = deck index of attached energy card chosen
+AIPickEnergyCardToDiscard: ; 2282e (8:682e)
+; load Pokémon's attached energy cards.
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CreateArenaOrBenchEnergyCardList
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	jr z, .no_energy
+
+; load card's ID and type.
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+
+; find a card that is not useful.
+; if none is found, just return the first energy card attached.
+	ld hl, wDuelTempList
+.loop
+	ld a, [hl]
+	cp $ff
+	jr z, .not_found
+	farcall CheckIfEnergyIsUseful
+	jr nc, .found
+	inc hl
+	jr .loop
+
+.found
+	ld a, [hl]
+	ret
+.not_found
+	ld hl, wDuelTempList
+	ld a, [hl]
+	ret
+.no_energy
+	ld a, $ff
+	ret
+
+; returns in a the deck index of an energy card attached to card
+; in player's Play Area location a to remove.
+; prioritizes double colorless energy, then any useful energy,
+; then defaults to the first energy card attached if neither
+; of those are found.
+; returns $ff in a if there are no energy cards attached.
+; input:
+;   a = Play Area location to check
+; output:
+;   a = deck index of attached energy card
+PickAttachedEnergyCardToRemove: ; 22875 (8:6875)
+; construct energy list and check if there are any energy cards attached
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CreateArenaOrBenchEnergyCardList
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	jr z, .no_energy
+
+; load card data and store its type
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+
+; first look for any double colorless energy
+	ld hl, wDuelTempList
+.loop_1
+	ld a, [hl]
+	cp $ff
+	jr z, .check_useful
+	push hl
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp DOUBLE_COLORLESS_ENERGY
+	pop hl
+	jr z, .found
+	inc hl
+	jr .loop_1
+
+; then look for any energy cards that are useful
+.check_useful
+	ld hl, wDuelTempList
+.loop_2
+	ld a, [hl]
+	cp $ff
+	jr z, .default
+	farcall CheckIfEnergyIsUseful
+	jr c, .found
+	inc hl
+	jr .loop_2
+
+; return the energy card that was found
+.found
+	ld a, [hl]
+	ret
+
+; if none were found with the above criteria,
+; just return the first option
+.default
+	ld hl, wDuelTempList
+	ld a, [hl]
+	ret
+
+; return $ff if no energy cards attached
+.no_energy
+	ld a, $ff
+	ret
+
+; stores in wTempAI and wCurCardCanAttack the deck indices
+; of energy cards attached to card in Play Area location a.
+; prioritizes double colorless energy, then any useful energy,
+; then defaults to the first two energy cards attached if neither
+; of those are found.
+; returns $ff in a if there are no energy cards attached.
+; input:
+;   a = Play Area location to check
+; output:
+;   [wTempAI] = deck index of attached energy card
+;   [wCurCardCanAttack] = deck index of attached energy card
+PickTwoAttachedEnergyCards: ; 228d1 (8:68d1)
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CreateArenaOrBenchEnergyCardList
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	farcall CountNumberOfEnergyCardsAttached
+	cp 2
+	jp c, .not_enough
+
+; load card data and store its type
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+	ld a, $ff
+	ld [wTempAI], a
+	ld [wCurCardCanAttack], a
+
+; first look for any double colorless energy
+	ld hl, wDuelTempList
+.loop_1
+	ld a, [hl]
+	cp $ff
+	jr z, .check_useful
+	push hl
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp DOUBLE_COLORLESS_ENERGY
+	pop hl
+	jr z, .found_double_colorless
+	inc hl
+	jr .loop_1
+.found_double_colorless
+	ld a, [wTempAI]
+	cp $ff
+	jr nz, .already_chosen_1
+	ld a, [hli]
+	ld [wTempAI], a
+	jr .loop_1
+.already_chosen_1
+	ld a, [hl]
+	ld [wCurCardCanAttack], a
+	jr .done
+
+; then look for any energy cards that are useful
+.check_useful
+	ld hl, wDuelTempList
+.loop_2
+	ld a, [hl]
+	cp $ff
+	jr z, .default
+	farcall CheckIfEnergyIsUseful
+	jr c, .found_useful
+	inc hl
+	jr .loop_2
+.found_useful
+	ld a, [wTempAI]
+	cp $ff
+	jr nz, .already_chosen_2
+	ld a, [hli]
+	ld [wTempAI], a
+	jr .loop_2
+.already_chosen_2
+	ld a, [hl]
+	ld [wCurCardCanAttack], a
+	jr .done
+
+; if none were found with the above criteria,
+; just return the first 2 options
+.default
+	ld hl, wDuelTempList
+	ld a, [wTempAI]
+	cp $ff
+	jr nz, .pick_one_card
+
+; pick 2 cards
+	ld a, [hli]
+	ld [wTempAI], a
+	ld a, [hl]
+	ld [wCurCardCanAttack], a
+	jr .done
+.pick_one_card
+	ld a, [wTempAI]
+	ld b, a
+.loop_3
+	ld a, [hli]
+	cp b
+	jr z, .loop_3 ; already picked
+	ld [wCurCardCanAttack], a
+
+.done
+	ld a, [wCurCardCanAttack]
+	ld b, a
+	ld a, [wTempAI]
+	ret
+
+; return $ff if no energy cards attached
+.not_enough
+	ld a, $ff
+	ret
+
+; copies $ff terminated buffer from hl to de
+CopyBuffer: ; 2297b (8:697b)
+	ld a, [hli]
+	ld [de], a
+	cp $ff
+	ret z
+	inc de
+	jr CopyBuffer
+
+; zeroes a bytes starting at hl
+ClearMemory_Bank8: ; 22983 (8:6983)
+	push af
+	push bc
+	push hl
+	ld b, a
+	xor a
+.loop
+	ld [hli], a
+	dec b
+	jr nz, .loop
+	pop hl
+	pop bc
+	pop af
+	ret
+
+; counts number of energy cards found in hand
+; and outputs result in a
+; sets carry if none are found
+; output:
+;	a = number of energy cards found
+CountOppEnergyCardsInHand: ; 22990 (8:6990)
+	farcall CreateEnergyCardListFromHand
+	ret c
+	ld b, -1
+	ld hl, wDuelTempList
+.loop
+	inc b
+	ld a, [hli]
+	cp $ff
+	jr nz, .loop
+	ld a, b
+	or a
+	ret
+
+; converts HP in a to number of equivalent damage counters
+; input:
+;	a = HP
+; output:
+;	a = number of damage counters
+ConvertHPToCounters: ; 229a3 (8:69a3)
+	push bc
+	ld c, 0
+.loop
+	sub 10
+	jr c, .carry
+	inc c
+	jr .loop
+.carry
+	ld a, c
+	pop bc
+	ret
+
+; calculates floor(hl / 10)
+CalculateWordTensDigit: ; 229b0 (8:69b0)
+	push bc
+	push de
+	lb bc, $ff, -10
+	lb de, $ff, -1
+.asm_229b8
+	inc de
+	add hl, bc
+	jr c, .asm_229b8
+	ld h, d
+	ld l, e
+	pop de
+	pop bc
+	ret
+
+; returns in a division of b by a
+CalculateBDividedByA_Bank8: ; 229c1 (8:69c1)
+	push bc
+	ld c, a
+	ld a, b
+	ld b, c
+	ld c, 0
+.loop
+	sub b
+	jr c, .done
+	inc c
+	jr .loop
+.done
+	ld a, c
+	pop bc
+	ret
+
+; returns in a the deck index of the first
+; instance of card with ID equal to the ID in e
+; in card location a.
+; returns carry if found.
+; input:
+;   a = CARD_LOCATION_*
+;   e = card ID to look for
+LookForCardIDInLocation: ; 229d0 (8:69d0)
+	ld b, a
+	ld c, e
+	lb de, $00, 0 ; d is never used
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp b
+	jr nz, .next
+	ld a, e
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp c
+	jr z, .found
+.next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop
+
+; not found
+	or a
+	ret
+.found
+	ld a, e
+	scf
+	ret
+
+; return carry if card ID loaded in a is found in hand
+; and outputs in a the deck index of that card
+; input:
+;	a = card ID
+; output:
+;	a = card deck index, if found
+;	carry set if found
+LookForCardIDInHandList_Bank8: ; 229f3 (8:69f3)
+	ld [wTempCardIDToLook], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+
+.loop
+	ld a, [hli]
+	cp $ff
+	ret z
+
+	ldh [hTempCardIndex_ff98], a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld b, a
+	ld a, [wTempCardIDToLook]
+	cp b
+	jr nz, .loop
+
+	ldh a, [hTempCardIndex_ff98]
+	scf
+	ret
+
+; searches in deck for card ID 1 in a, and
+; if found, searches in Hand/Play Area for card ID 2 in b, and
+; if found, searches for card ID 1 in Hand/Play Area, and
+; if none found, return carry and output deck index
+; of the card ID 1 in deck.
+; input:
+;   a = card ID 1
+;   b = card ID 2
+; output:
+;   a = index of card ID 1 in deck
+LookForCardIDInDeck_GivenCardIDInHandAndPlayArea: ; 22a10 (8:6a10)
+; store a in wCurCardCanAttack
+; and b in wTempAI
+	ld c, a
+	ld a, b
+	ld [wTempAI], a
+	ld a, c
+	ld [wCurCardCanAttack], a
+
+; look for the card ID 1 in deck
+	ld e, a
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret nc
+
+; was found, store its deck index in memory
+	ld [wTempAIPokemonCard], a
+
+; look for the card ID 2
+; in Hand and Play Area, return if not found.
+	ld a, [wTempAI]
+	call LookForCardIDInHandAndPlayArea
+	ret nc
+
+; look for the card ID 1 in the Hand and Play Area
+; if any card is found, return no carry.
+	ld a, [wCurCardCanAttack]
+	call LookForCardIDInHandAndPlayArea
+	jr c, .no_carry
+; none found
+
+	ld a, [wTempAIPokemonCard]
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+; returns carry if card ID in a
+; is found in Play Area or in hand
+; input:
+;	a = card ID
+LookForCardIDInHandAndPlayArea: ; 22a39 (8:6a39)
+	ld b, a
+	push bc
+	call LookForCardIDInHandList_Bank8
+	pop bc
+	ret c
+
+	ld a, b
+	ld b, PLAY_AREA_ARENA
+	call LookForCardIDInPlayArea_Bank8
+	ret c
+	or a
+	ret
+
+; searches in deck for card ID 1 in a, and
+; if found, searches in Hand Area for card ID 2 in b, and
+; if found, searches for card ID 1 in Hand/Play Area, and
+; if none found, return carry and output deck index
+; of the card ID 1 in deck.
+; input:
+;   a = card ID 1
+;   b = card ID 2
+; output:
+;   a = index of card ID 1 in deck
+LookForCardIDInDeck_GivenCardIDInHand: ; 22a49 (8:6a49)
+; store a in wCurCardCanAttack
+; and b in wTempAI
+	ld c, a
+	ld a, b
+	ld [wTempAI], a
+	ld a, c
+	ld [wCurCardCanAttack], a
+
+; look for the card ID 1 in deck
+	ld e, a
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret nc
+
+; was found, store its deck index in memory
+	ld [wTempAIPokemonCard], a
+
+; look for the card ID 2 in hand, return if not found.
+	ld a, [wTempAI]
+	call LookForCardIDInHandList_Bank8
+	ret nc
+
+; look for the card ID 1 in the Hand and Play Area
+; if any card is found, return no carry.
+	ld a, [wCurCardCanAttack]
+	call LookForCardIDInHandAndPlayArea
+	jr c, .no_carry
+; none found
+
+	ld a, [wTempAIPokemonCard]
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+; returns carry if card ID in a
+; is found in Play Area, starting with
+; location in b
+; input:
+;	a = card ID
+;	b = PLAY_AREA_* to start with
+; output:
+;	a = PLAY_AREA_* of found card
+;	carry set if found
+LookForCardIDInPlayArea_Bank8: ; 22a72 (8:6a72)
+	ld [wTempCardIDToLook], a
+.loop
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	cp $ff
+	ret z
+
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld c, a
+	ld a, [wTempCardIDToLook]
+	cp c
+	jr z, .is_same
+
+	inc b
+	ld a, MAX_PLAY_AREA_POKEMON
+	cp b
+	jr nz, .loop
+	ld b, $ff
+	or a
+	ret
+
+.is_same
+	ld a, b
+	scf
+	ret
+
+; runs through list avoiding card in e.
+; removes first card in list not equal to e
+; and that has a type allowed to be removed, in d.
+; returns carry if successful in finding a card.
+; input:
+;   d = type of card allowed to be removed
+;       ($00 = Trainer, $01 = Pokemon, $02 = Energy)
+;   e = card deck index to avoid removing
+; output:
+;   a = card index of removed card
+RemoveFromListDifferentCardOfGivenType: ; 22a95 (8:6a95)
+	push hl
+	push de
+	push bc
+	call CountCardsInDuelTempList
+	call ShuffleCards
+
+; loop list until a card with
+; deck index different from e is found.
+.loop_list
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	cp e
+	jr z, .loop_list
+
+; get this card's type
+	ldh [hTempCardIndex_ff98], a
+	push de
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	pop de
+	cp TYPE_ENERGY
+	jr c, .pkmn_card
+	cp TYPE_TRAINER
+	jr nz, .energy
+
+; only remove from list specific type.
+
+; trainer
+	ld a, d
+	or a
+	jr nz, .loop_list
+	jr .remove_card
+.energy
+	ld a, d
+	cp $02
+	jr nz, .loop_list
+	jr .remove_card
+.pkmn_card
+	ld a, d
+	cp $01
+	jr nz, .loop_list
+	; fallthrough
+
+.remove_card
+	ld d, h
+	ld e, l
+	dec hl
+.loop_remove
+	ld a, [de]
+	inc de
+	ld [hli], a
+	cp $ff
+	jr nz, .loop_remove
+
+; success
+	ldh a, [hTempCardIndex_ff98]
+	pop bc
+	pop de
+	pop hl
+	scf
+	ret
+.no_carry
+	pop bc
+	pop de
+	pop hl
+	or a
+	ret
+
+; used in Pokemon Trader checks to look for a specific
+; card in the deck to trade with a card in hand that
+; has a card ID different from e.
+; returns carry if successful.
+; input:
+;   a = card ID 1
+;   e = card ID 2
+; output:
+;   a = deck index of card ID 1 found in deck
+;   e = deck index of Pokemon card in hand different than card ID 2
+LookForCardIDToTradeWithDifferentHandCard: ; 22ae0 (8:6ae0)
+	ld hl, wCurCardCanAttack
+	ld [hl], e
+	ld [wTempAI], a
+
+; if card ID 1 is in hand, return no carry.
+	call LookForCardIDInHandList_Bank8
+	jr c, .no_carry
+
+; if card ID 1 is not in deck, return no carry.
+	ld a, [wTempAI]
+	ld e, a
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .no_carry
+
+; store its deck index
+	ld [wTempAI], a
+
+; look in hand for Pokemon card ID that
+; is different from card ID 2.
+	ld a, [wCurCardCanAttack]
+	ld c, a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+
+.loop_hand
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp c
+	jr z, .loop_hand
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr nc, .loop_hand
+
+; found, output deck index of card ID 1 in deck
+; and deck index of card found in hand, and set carry
+	ld e, b
+	ld a, [wTempAI]
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+; returns carry if at least one card in the hand
+; has the card ID of input. Outputs its index.
+; input:
+;   a = card ID to look for
+; output:
+;   a = deck index of card in hand found
+CheckIfHasCardIDInHand: ; 22b1f (8:6b1f)
+	ld [wTempCardIDToLook], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld c, 0
+
+.loop_hand
+	ld a, [hli]
+	cp $ff
+	ret z
+	ldh [hTempCardIndex_ff98], a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld b, a
+	ld a, [wTempCardIDToLook]
+	cp b
+	jr nz, .loop_hand
+	ld a, c
+	or a
+	jr nz, .set_carry
+	inc c
+	jr nz, .loop_hand
+
+.set_carry
+	ldh a, [hTempCardIndex_ff98]
+	scf
+	ret
+
+; outputs in a total number of Pokemon cards in hand
+; plus Pokemon in Turn Duelist's Play Area.
+CountPokemonCardsInHandAndInPlayArea: ; 22b45 (8:6b45)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld [wTempAI], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.loop_hand
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	cp TYPE_ENERGY
+	jr nc, .loop_hand
+	ld a, [wTempAI]
+	inc a
+	ld [wTempAI], a
+	jr .loop_hand
+.done
+	ld a, [wTempAI]
+	ret
+
+; returns carry if a duplicate Pokemon card is found in hand.
+; outputs in a the deck index of one of them.
+FindDuplicatePokemonCards: ; 22b6f (8:6b6f)
+	ld a, $ff
+	ld [wTempAI], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	push hl
+
+.loop_hand_outer
+	pop hl
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+	call GetCardIDFromDeckIndex
+	ld b, e
+	push hl
+
+.loop_hand_inner
+	ld a, [hli]
+	cp $ff
+	jr z, .loop_hand_outer
+	ld c, a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp b
+	jr nz, .loop_hand_inner
+
+; found two cards with same ID,
+; if they are Pokemon cards, store its deck index.
+	push bc
+	call GetCardType
+	pop bc
+	cp TYPE_ENERGY
+	jr nc, .loop_hand_outer
+	ld a, c
+	ld [wTempAI], a
+	; for some reason loop still continues
+	; even though if some other duplicate
+	; cards are found, it overwrites the result.
+	jr .loop_hand_outer
+
+.done
+	ld a, [wTempAI]
+	cp $ff
+	jr z, .no_carry
+
+; found
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; return carry flag if attack is not high recoil.
+AICheckIfAttackIsHighRecoil: ; 22bad (8:6bad)
+	farcall AIProcessButDontUseAttack
+	ret nc
+	ld a, [wSelectedAttack]
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, ATTACK_FLAG1_ADDRESS | HIGH_RECOIL_F
+	call CheckLoadedAttackFlag
+	ccf
+	ret
diff --git a/src/engine/ai/core.asm b/src/engine/ai/core.asm
new file mode 100644
index 0000000..f182375
--- /dev/null
+++ b/src/engine/ai/core.asm
@@ -0,0 +1,2770 @@
+INCLUDE "engine/ai/decks/unreferenced.asm"
+
+; returns carry if damage dealt from any of
+; a card's attacks KOs defending Pokémon
+; outputs index of the attack that KOs
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of attacking card to consider
+; output:
+;	[wSelectedAttack] = attack index that KOs
+CheckIfAnyAttackKnocksOutDefendingCard: ; 140ae (5:40ae)
+	xor a ; first attack
+	call CheckIfAttackKnocksOutDefendingCard
+	ret c
+	ld a, SECOND_ATTACK
+;	fallthrough
+
+CheckIfAttackKnocksOutDefendingCard: ; 140b5 (5:40b5)
+	call EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	ret c
+	ret nz
+	scf
+	ret
+
+; returns carry if any of the defending Pokémon's attacks
+; brings card at hTempPlayAreaLocation_ff9d down
+; to exactly 0 HP.
+; outputs that attack index in wSelectedAttack.
+CheckIfAnyDefendingPokemonAttackDealsSameDamageAsHP: ; 140c5 (5:40c5)
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	call .check_damage
+	ret c
+	ld a, SECOND_ATTACK
+
+.check_damage
+	call EstimateDamage_FromDefendingPokemon
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jr z, .true
+	ret
+.true
+	scf
+	ret
+
+; checks AI scores for all benched Pokémon
+; returns the location of the card with highest score
+; in a and [hTempPlayAreaLocation_ff9d]
+FindHighestBenchScore: ; 140df (5:40df)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, 0
+	ld e, c
+	ld d, c
+	ld hl, wPlayAreaAIScore + 1
+	jp .next
+
+.loop
+	ld a, [hli]
+	cp e
+	jr c, .next
+	ld e, a
+	ld d, c
+.next
+	inc c
+	dec b
+	jr nz, .loop
+
+	ld a, d
+	ldh [hTempPlayAreaLocation_ff9d], a
+	or a
+	ret
+
+; adds a to wAIScore
+; if there's overflow, it's capped at $ff
+; output:
+;	a = a + wAIScore (capped at $ff)
+AddToAIScore: ; 140fe (5:40fe)
+	push hl
+	ld hl, wAIScore
+	add [hl]
+	jr nc, .no_cap
+	ld a, $ff
+.no_cap
+	ld [hl], a
+	pop hl
+	ret
+
+; subs a from wAIScore
+; if there's underflow, it's capped at $00
+SubFromAIScore: ; 1410a (5:410a)
+	push hl
+	push de
+	ld e, a
+	ld hl, wAIScore
+	ld a, [hl]
+	or a
+	jr z, .done
+	sub e
+	ld [hl], a
+	jr nc, .done
+	ld [hl], $00
+.done
+	pop de
+	pop hl
+	ret
+
+; loads defending Pokémon's weakness/resistance
+; and the number of prize cards in both sides
+LoadDefendingPokemonColorWRAndPrizeCards: ; 1411d (5:411d)
+	call SwapTurn
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld [wAIPlayerColor], a
+	call GetArenaCardWeakness
+	ld [wAIPlayerWeakness], a
+	call GetArenaCardResistance
+	ld [wAIPlayerResistance], a
+	call CountPrizes
+	ld [wAIPlayerPrizeCount], a
+	call SwapTurn
+	call CountPrizes
+	ld [wAIOpponentPrizeCount], a
+	ret
+
+; called when AI has chosen its attack.
+; executes all effects and damage.
+; handles AI choosing parameters for certain attacks as well.
+AITryUseAttack: ; 14145 (5:4145)
+	ld a, [wSelectedAttack]
+	ldh [hTemp_ffa0], a
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ldh [hTempCardIndex_ff9f], a
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, OPPACTION_BEGIN_ATTACK
+	bank1call AIMakeDecision
+	ret c
+
+	call AISelectSpecialAttackParameters
+	jr c, .use_attack
+	ld a, EFFECTCMDTYPE_AI_SELECTION
+	call TryExecuteEffectCommandFunction
+
+.use_attack
+	ld a, [wSelectedAttack]
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, OPPACTION_USE_ATTACK
+	bank1call AIMakeDecision
+	ret c
+
+	ld a, EFFECTCMDTYPE_AI_SWITCH_DEFENDING_PKMN
+	call TryExecuteEffectCommandFunction
+	ld a, OPPACTION_ATTACK_ANIM_AND_DAMAGE
+	bank1call AIMakeDecision
+	ret
+
+; return carry if any of the following is satisfied:
+;	- deck index in a corresponds to a double colorless energy card;
+;	- card type in wTempCardType is colorless;
+;	- card ID in wTempCardID is a Pokémon card that has
+;	  attacks that require energy other than its color and
+;	  the deck index in a corresponds to that energy type;
+;	- card ID is Eevee and a corresponds to an energy type
+;	  of water, fire or lightning;
+;	- type of card in register a is the same as wTempCardType.
+; used for knowing if a given energy card can be discarded
+; from a given Pokémon card
+; input:
+;	a = energy card attached to Pokémon to check
+;	[wTempCardType] = TYPE_ENERGY_* of given Pokémon
+;	[wTempCardID] = card index of Pokémon card to check
+CheckIfEnergyIsUseful: ; 14184 (5:4184)
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp DOUBLE_COLORLESS_ENERGY
+	jr z, .set_carry
+	ld a, [wTempCardType]
+	cp TYPE_ENERGY_DOUBLE_COLORLESS
+	jr z, .set_carry
+	ld a, [wTempCardID]
+
+	ld d, PSYCHIC_ENERGY
+	cp EXEGGCUTE
+	jr z, .check_energy
+	cp EXEGGUTOR
+	jr z, .check_energy
+	cp PSYDUCK
+	jr z, .check_energy
+	cp GOLDUCK
+	jr z, .check_energy
+
+	ld d, WATER_ENERGY
+	cp SURFING_PIKACHU1
+	jr z, .check_energy
+	cp SURFING_PIKACHU2
+	jr z, .check_energy
+
+	cp EEVEE
+	jr nz, .check_type
+	ld a, e
+	cp WATER_ENERGY
+	jr z, .set_carry
+	cp FIRE_ENERGY
+	jr z, .set_carry
+	cp LIGHTNING_ENERGY
+	jr z, .set_carry
+
+.check_type
+	ld d, $00 ; unnecessary?
+	call GetCardType
+	ld d, a
+	ld a, [wTempCardType]
+	cp d
+	jr z, .set_carry
+	pop de
+	or a
+	ret
+
+.check_energy
+	ld a, d
+	cp e
+	jr nz, .check_type
+.set_carry
+	pop de
+	scf
+	ret
+
+; pick a random Pokemon in the bench.
+; output:
+;	- a = PLAY_AREA_* of Bench Pokemon picked.
+PickRandomBenchPokemon: ; 141da (5:41da)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	call Random
+	inc a
+	ret
+
+AIPickPrizeCards: ; 141e5 (5:41e5)
+	ld a, [wNumberPrizeCardsToTake]
+	ld b, a
+.loop
+	call .PickPrizeCard
+	ld a, DUELVARS_PRIZES
+	call GetTurnDuelistVariable
+	or a
+	jr z, .done
+	dec b
+	jr nz, .loop
+.done
+	ret
+
+; picks a prize card at random
+; and adds it to the hand.
+.PickPrizeCard: ; 141f8 (5:41f8)
+	ld a, DUELVARS_PRIZES
+	call GetTurnDuelistVariable
+	push hl
+	ld c, a
+
+; choose a random prize card until
+; one is found that isn't taken already.
+.loop_pick_prize
+	ld a, 6
+	call Random
+	ld e, a
+	ld d, $00
+	ld hl, .prize_flags
+	add hl, de
+	ld a, [hl]
+	and c
+	jr z, .loop_pick_prize ; no prize
+
+; prize card was found
+; remove this prize from wOpponentPrizes
+	ld a, [hl]
+	pop hl
+	cpl
+	and [hl]
+	ld [hl], a
+
+; add this prize card to the hand
+	ld a, e
+	add DUELVARS_PRIZE_CARDS
+	call GetTurnDuelistVariable
+	call AddCardToHand
+	ret
+
+.prize_flags ; 1421e (5:421e)
+	db $1 << 0
+	db $1 << 1
+	db $1 << 2
+	db $1 << 3
+	db $1 << 4
+	db $1 << 5
+	db $1 << 6
+	db $1 << 7
+
+; routine for AI to play all Basic cards from its hand
+; in the beginning of the Duel.
+AIPlayInitialBasicCards: ; 14226 (5:4226)
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.check_for_next_card
+	ld a, [hli]
+	ldh [hTempCardIndex_ff98], a
+	cp $ff
+	ret z ; return when done
+
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr nc, .check_for_next_card ; skip if not Pokemon card
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .check_for_next_card ; skip if not Basic Stage
+
+; play Basic card from hand
+	push hl
+	ldh a, [hTempCardIndex_ff98]
+	call PutHandPokemonCardInPlayArea
+	pop hl
+	jr .check_for_next_card
+
+; returns carry if Pokémon at hTempPlayAreaLocation_ff9d
+; can't use an attack or if that selected attack doesn't have enough energy
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of Pokémon card
+;	[wSelectedAttack]         = selected attack to examine
+CheckIfSelectedAttackIsUnusable: ; 1424b (5:424b)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .bench
+
+	bank1call HandleCantAttackSubstatus
+	ret c
+	bank1call CheckIfActiveCardParalyzedOrAsleep
+	ret c
+
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	call HandleAmnesiaSubstatus
+	ret c
+	ld a, EFFECTCMDTYPE_INITIAL_EFFECT_1
+	call TryExecuteEffectCommandFunction
+	ret c
+
+.bench
+	call CheckEnergyNeededForAttack
+	ret c ; can't be used
+	ld a, ATTACK_FLAG2_ADDRESS | FLAG_2_BIT_5_F
+	call CheckLoadedAttackFlag
+	ret
+
+; load selected attack from Pokémon in hTempPlayAreaLocation_ff9d
+; and checks if there is enough energy to execute the selected attack
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of Pokémon card
+;	[wSelectedAttack]         = selected attack to examine
+; output:
+;	b = basic energy still needed
+;	c = colorless energy still needed
+;	e = output of ConvertColorToEnergyCardID, or $0 if not an attack
+;	carry set if no attack
+;	       OR if it's a Pokémon Power
+;	       OR if not enough energy for attack
+CheckEnergyNeededForAttack: ; 14279 (5:4279)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld hl, wLoadedAttackName
+	ld a, [hli]
+	or [hl]
+	jr z, .no_attack
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr nz, .is_attack
+.no_attack
+	lb bc, 0, 0
+	ld e, c
+	scf
+	ret
+
+.is_attack
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	bank1call HandleEnergyBurn
+
+	xor a
+	ld [wTempLoadedAttackEnergyCost], a
+	ld [wTempLoadedAttackEnergyNeededAmount], a
+	ld [wTempLoadedAttackEnergyNeededType], a
+
+	ld hl, wAttachedEnergies
+	ld de, wLoadedAttackEnergyCost
+	ld b, 0
+	ld c, (NUM_TYPES / 2) - 1
+
+.loop
+	; check all basic energy cards except colorless
+	ld a, [de]
+	swap a
+	call CheckIfEnoughParticularAttachedEnergy
+	ld a, [de]
+	call CheckIfEnoughParticularAttachedEnergy
+	inc de
+	dec c
+	jr nz, .loop
+
+; running CheckIfEnoughParticularAttachedEnergy back to back like this
+; overwrites the results of a previous call of this function,
+; however, no attack in the game has energy requirements for two
+; different energy types (excluding colorless), so this routine
+; will always just return the result for one type of basic energy,
+; while all others will necessarily have an energy cost of 0
+; if attacks are added to the game with energy requirements of
+; two different basic energy types, then this routine only accounts
+; for the type with the highest index
+
+	; colorless
+	ld a, [de]
+	swap a
+	and %00001111
+	ld b, a ; colorless energy still needed
+	ld a, [wTempLoadedAttackEnergyCost]
+	ld hl, wTempLoadedAttackEnergyNeededAmount
+	sub [hl]
+	ld c, a ; basic energy still needed
+	ld a, [wTotalAttachedEnergies]
+	sub c
+	sub b
+	jr c, .not_enough
+
+	ld a, [wTempLoadedAttackEnergyNeededAmount]
+	or a
+	ret z
+
+; being here means the energy cost isn't satisfied,
+; including with colorless energy
+	xor a
+.not_enough
+	cpl
+	inc a
+	ld c, a ; colorless energy still needed
+	ld a, [wTempLoadedAttackEnergyNeededAmount]
+	ld b, a ; basic energy still needed
+	ld a, [wTempLoadedAttackEnergyNeededType]
+	call ConvertColorToEnergyCardID
+	ld e, a
+	ld d, 0
+	scf
+	ret
+
+; takes as input the energy cost of an attack for a
+; particular energy, stored in the lower nibble of a
+; if the attack costs some amount of this energy, the lower nibble of a != 0,
+; and this amount is stored in wTempLoadedAttackEnergyCost
+; sets carry flag if not enough energy of this type attached
+; input:
+;	a    = this energy cost of attack (lower nibble)
+;	[hl] = attached energy
+; output:
+;	carry set if not enough of this energy type attached
+CheckIfEnoughParticularAttachedEnergy: ; 142f4 (5:42f4)
+	and %00001111
+	jr nz, .check
+.has_enough
+	inc hl
+	inc b
+	or a
+	ret
+
+.check
+	ld [wTempLoadedAttackEnergyCost], a
+	sub [hl]
+	jr z, .has_enough
+	jr c, .has_enough
+
+	; not enough energy
+	ld [wTempLoadedAttackEnergyNeededAmount], a
+	ld a, b
+	ld [wTempLoadedAttackEnergyNeededType], a
+	inc hl
+	inc b
+	scf
+	ret
+
+; input:
+;	a = energy type
+; output:
+;	a = energy card ID
+ConvertColorToEnergyCardID: ; 1430f (5:430f)
+	push hl
+	push de
+	ld e, a
+	ld d, 0
+	ld hl, .card_id
+	add hl, de
+	ld a, [hl]
+	pop de
+	pop hl
+	ret
+
+.card_id
+	db FIRE_ENERGY
+	db GRASS_ENERGY
+	db LIGHTNING_ENERGY
+	db WATER_ENERGY
+	db FIGHTING_ENERGY
+	db PSYCHIC_ENERGY
+	db DOUBLE_COLORLESS_ENERGY
+
+; returns carry if loaded attack effect has
+; an "initial effect 2" or "require selection" command type
+; unreferenced
+Func_14323: ; 14323 (5:4323)
+	ld hl, wLoadedAttackEffectCommands
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	ld a, EFFECTCMDTYPE_INITIAL_EFFECT_2
+	push hl
+	call CheckMatchingCommand
+	pop hl
+	jr nc, .set_carry
+	ld a, EFFECTCMDTYPE_REQUIRE_SELECTION
+	call CheckMatchingCommand
+	jr nc, .set_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; return carry depending on card index in a:
+;	- if energy card, return carry if no energy card has been played yet
+;	- if basic Pokémon card, return carry if there's space in bench
+;	- if evolution card, return carry if there's a Pokémon
+;	  in Play Area it can evolve
+;	- if trainer card, return carry if it can be used
+; input:
+;	a = card index to check
+CheckIfCardCanBePlayed: ; 1433d (5:433d)
+	ldh [hTempCardIndex_ff9f], a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr c, .pokemon_card
+	cp TYPE_TRAINER
+	jr z, .trainer_card
+
+; energy card
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	ret z
+	scf
+	ret
+
+.pokemon_card
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .evolution_card
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	ccf
+	ret
+
+.evolution_card
+	bank1call IsPrehistoricPowerActive
+	ret c
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+	ld b, 0
+.loop
+	push bc
+	ld e, b
+	ldh a, [hTempCardIndex_ff9f]
+	ld d, a
+	call CheckIfCanEvolveInto
+	pop bc
+	ret nc
+	inc b
+	dec c
+	jr nz, .loop
+	scf
+	ret
+
+.trainer_card
+	bank1call CheckCantUseTrainerDueToHeadache
+	ret c
+	call LoadNonPokemonCardEffectCommands
+	ld a, EFFECTCMDTYPE_INITIAL_EFFECT_1
+	call TryExecuteEffectCommandFunction
+	ret
+
+; loads all the energy cards
+; in hand in wDuelTempList
+; return carry if no energy cards found
+CreateEnergyCardListFromHand: ; 1438c (5:438c)
+	push hl
+	push de
+	push bc
+	ld de, wDuelTempList
+	ld b, a
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	ld c, a
+	inc c
+	ld l, LOW(wOpponentHand)
+	jr .decrease
+
+.loop
+	ld a, [hli]
+	push de
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	pop de
+	and TYPE_ENERGY
+	jr z, .decrease
+	dec hl
+	ld a, [hli]
+	ld [de], a
+	inc de
+.decrease
+	dec c
+	jr nz, .loop
+
+	ld a, $ff
+	ld [de], a
+	pop bc
+	pop de
+	pop hl
+	ld a, [wDuelTempList]
+	cp $ff
+	ccf
+	ret
+
+; looks for card ID in hand and
+; sets carry if a card wasn't found
+; as opposed to LookForCardIDInHandList_Bank5
+; this function doesn't create a list
+; and preserves hl, de and bc
+; input:
+;	a = card ID
+; output:
+;	a = card deck index, if found
+;	carry set if NOT found
+LookForCardIDInHand: ; 143bf (5:43bf)
+	push hl
+	push de
+	push bc
+	ld b, a
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	ld c, a
+	inc c
+	ld l, DUELVARS_HAND
+	jr .next
+
+.loop
+	ld a, [hli]
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp b
+	jr z, .no_carry
+.next
+	dec c
+	jr nz, .loop
+
+	pop bc
+	pop de
+	pop hl
+	scf
+	ret
+
+.no_carry
+	dec hl
+	ld a, [hl]
+	pop bc
+	pop de
+	pop hl
+	or a
+	ret
+
+INCLUDE "engine/ai/damage_calculation.asm"
+
+AIProcessHandTrainerCards: ; 14663 (5:4663)
+	farcall _AIProcessHandTrainerCards
+	ret
+
+INCLUDE "engine/ai/deck_ai.asm"
+
+; return carry if card ID loaded in a is found in hand
+; and outputs in a the deck index of that card
+; as opposed to LookForCardIDInHand, this function
+; creates a list in wDuelTempList
+; input:
+;	a = card ID
+; output:
+;	a = card deck index, if found
+;	carry set if found
+LookForCardIDInHandList_Bank5: ; 155d2 (5:55d2)
+	ld [wTempCardIDToLook], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+
+.loop
+	ld a, [hli]
+	cp $ff
+	ret z
+	ldh [hTempCardIndex_ff98], a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld b, a
+	ld a, [wTempCardIDToLook]
+	cp b
+	jr nz, .loop
+
+	ldh a, [hTempCardIndex_ff98]
+	scf
+	ret
+
+; returns carry if card ID in a
+; is found in Play Area, starting with
+; location in b
+; input:
+;	a = card ID
+;	b = PLAY_AREA_* to start with
+; output:
+;	a = PLAY_AREA_* of found card
+;	carry set if found
+LookForCardIDInPlayArea_Bank5: ; 155ef (5:55ef)
+	ld [wTempCardIDToLook], a
+
+.loop
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	cp $ff
+	ret z
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld c, a
+	ld a, [wTempCardIDToLook]
+	cp c
+	jr z, .found
+	inc b
+	ld a, MAX_PLAY_AREA_POKEMON
+	cp b
+	jr nz, .loop
+
+	ld b, $ff
+	or a
+	ret
+.found
+	ld a, b
+	scf
+	ret
+
+; check if energy card ID in e is in AI hand and,
+; if so, attaches it to card ID in d in Play Area.
+; input:
+;	e = Energy card ID
+;	d = Pokemon card ID
+AIAttachEnergyInHandToCardInPlayArea: ; 15612 (5:5612)
+	ld a, e
+	push de
+	call LookForCardIDInHandList_Bank5
+	pop de
+	ret nc ; not in hand
+	ld b, PLAY_AREA_ARENA
+
+.attach
+	ld e, a
+	ld a, d
+	call LookForCardIDInPlayArea_Bank5
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, e
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_ENERGY
+	bank1call AIMakeDecision
+	ret
+
+; same as AIAttachEnergyInHandToCardInPlayArea but
+; only look for card ID in the Bench.
+AIAttachEnergyInHandToCardInBench: ; 1562b (5:562b)
+	ld a, e
+	push de
+	call LookForCardIDInHandList_Bank5
+	pop de
+	ret nc
+	ld b, PLAY_AREA_BENCH_1
+	jr AIAttachEnergyInHandToCardInPlayArea.attach
+
+INCLUDE "engine/ai/init.asm"
+
+; load selected attack from Pokémon in hTempPlayAreaLocation_ff9d,
+; gets an energy card to discard and subsequently
+; check if there is enough energy to execute the selected attack
+; after removing that attached energy card.
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of Pokémon card
+;	[wSelectedAttack]         = selected attack to examine
+; output:
+;	b = basic energy still needed
+;	c = colorless energy still needed
+;	e = output of ConvertColorToEnergyCardID, or $0 if not an attack
+;	carry set if no attack
+;	       OR if it's a Pokémon Power
+;	       OR if not enough energy for attack
+CheckEnergyNeededForAttackAfterDiscard: ; 156c3 (5:56c3)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld hl, wLoadedAttackName
+	ld a, [hli]
+	or [hl]
+	jr z, .no_attack
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr nz, .is_attack
+.no_attack
+	lb bc, 0, 0
+	ld e, c
+	scf
+	ret
+
+.is_attack
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	farcall AIPickEnergyCardToDiscard
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp DOUBLE_COLORLESS_ENERGY
+	jr z, .colorless
+
+; color energy
+; decrease respective attached energy by 1.
+	ld hl, wAttachedEnergies
+	dec a
+	ld c, a
+	ld b, $00
+	add hl, bc
+	dec [hl]
+	ld hl, wTotalAttachedEnergies
+	dec [hl]
+	jr .asm_1570c
+; decrease attached colorless by 2.
+.colorless
+	ld hl, wAttachedEnergies + COLORLESS
+	dec [hl]
+	dec [hl]
+	ld hl, wTotalAttachedEnergies
+	dec [hl]
+	dec [hl]
+
+.asm_1570c
+	bank1call HandleEnergyBurn
+	xor a
+	ld [wTempLoadedAttackEnergyCost], a
+	ld [wTempLoadedAttackEnergyNeededAmount], a
+	ld [wTempLoadedAttackEnergyNeededType], a
+	ld hl, wAttachedEnergies
+	ld de, wLoadedAttackEnergyCost
+	ld b, 0
+	ld c, (NUM_TYPES / 2) - 1
+.loop
+	; check all basic energy cards except colorless
+	ld a, [de]
+	swap a
+	call CheckIfEnoughParticularAttachedEnergy
+	ld a, [de]
+	call CheckIfEnoughParticularAttachedEnergy
+	inc de
+	dec c
+	jr nz, .loop
+
+	ld a, [de]
+	swap a
+	and $0f
+	ld b, a ; colorless energy still needed
+	ld a, [wTempLoadedAttackEnergyCost]
+	ld hl, wTempLoadedAttackEnergyNeededAmount
+	sub [hl]
+	ld c, a ; basic energy still needed
+	ld a, [wTotalAttachedEnergies]
+	sub c
+	sub b
+	jr c, .not_enough_energy
+
+	ld a, [wTempLoadedAttackEnergyNeededAmount]
+	or a
+	ret z
+
+; being here means the energy cost isn't satisfied,
+; including with colorless energy
+	xor a
+.not_enough_energy
+	cpl
+	inc a
+	ld c, a ; colorless energy still needed
+	ld a, [wTempLoadedAttackEnergyNeededAmount]
+	ld b, a ; basic energy still needed
+	ld a, [wTempLoadedAttackEnergyNeededType]
+	call ConvertColorToEnergyCardID
+	ld e, a
+	ld d, 0
+	scf
+	ret
+
+; zeroes a bytes starting at hl
+ClearMemory_Bank5: ; 1575e (5:575e)
+	push af
+	push bc
+	push hl
+	ld b, a
+	xor a
+.clear_loop
+	ld [hli], a
+	dec b
+	jr nz, .clear_loop
+	pop hl
+	pop bc
+	pop af
+	ret
+
+; returns in a the tens digit of value in a
+CalculateByteTensDigit: ; 1576b (5:576b)
+	push bc
+	ld c, 0
+.loop
+	sub 10
+	jr c, .done
+	inc c
+	jr .loop
+.done
+	ld a, c
+	pop bc
+	ret
+
+; returns in a the result of
+; dividing b by a, rounded down
+; input:
+;	a = divisor
+;	b = dividend
+CalculateBDividedByA_Bank5: ; 15778 (5:5778)
+	push bc
+	ld c, a
+	ld a, b
+	ld b, c
+	ld c, 0
+.loop
+	sub b
+	jr c, .done
+	inc c
+	jr .loop
+.done
+	ld a, c
+	pop bc
+	ret
+
+; returns in a the number of energy cards attached
+; to Pokémon in location held by e
+; this assumes that colorless are paired so
+; that one colorless energy card provides 2 colorless energy
+; input:
+;	e = location to check, i.e. PLAY_AREA_*
+; output:
+;	a = number of energy cards attached
+CountNumberOfEnergyCardsAttached: ; 15787 (5:5787)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	ret z
+
+	xor a
+	push hl
+	push bc
+	ld b, NUM_COLORED_TYPES
+	ld hl, wAttachedEnergies
+; sum all the attached energies
+.loop
+	add [hl]
+	inc hl
+	dec b
+	jr nz, .loop
+
+	ld b, [hl]
+	srl b
+; counts colorless ad halves it
+	add b
+	pop bc
+	pop hl
+	ret
+
+; returns carry if any card with ID in e is found
+; in card location in a
+; input:
+;	a = card location to look in;
+;	e = card ID to look for.
+; output:
+;	a = deck index of card found, if any
+CheckIfAnyCardIDinLocation: ; 157a3 (5:57a3)
+	ld b, a
+	ld c, e
+	lb de, 0, 0
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp b
+	jr nz, .next
+	ld a, e
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp c
+	jr z, .set_carry
+.next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop
+	or a
+	ret
+.set_carry
+	ld a, e
+	scf
+	ret
+
+; counts total number of energy cards in opponent's hand
+; plus all the cards attached in Turn Duelist's Play Area.
+; output:
+;	a and wTempAI = total number of energy cards.
+CountOppEnergyCardsInHandAndAttached: ; 157c6 (5:57c6)
+	xor a
+	ld [wTempAI], a
+	call CreateEnergyCardListFromHand
+	jr c, .attached
+
+; counts number of energy cards in hand
+	ld b, -1
+	ld hl, wDuelTempList
+.loop_hand
+	inc b
+	ld a, [hli]
+	cp $ff
+	jr nz, .loop_hand
+	ld a, b
+	ld [wTempAI], a
+
+; counts number of energy cards
+; that are attached in Play Area
+.attached
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+.loop_play_area
+	call CountNumberOfEnergyCardsAttached
+	ld hl, wTempAI
+	add [hl]
+	ld [hl], a
+	inc e
+	dec d
+	jr nz, .loop_play_area
+	ret
+
+; returns carry if any card with ID in e is found
+; in the list that is pointed by hl.
+; if one is found, it is removed from the list.
+; input:
+;   e  = card ID to look for.
+;   hl = list to look in
+RemoveCardIDInList: ; 157f3 (5:57f3)
+	push hl
+	push de
+	push bc
+	ld c, e
+
+.loop_1
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+
+	ldh [hTempCardIndex_ff98], a
+	call GetCardIDFromDeckIndex
+	ld a, c
+	cp e
+	jr nz, .loop_1
+
+; found
+	ld d, h
+	ld e, l
+	dec hl
+
+; remove this index from the list
+; and reposition the rest of the list ahead.
+.loop_2
+	ld a, [de]
+	inc de
+	ld [hli], a
+	cp $ff
+	jr nz, .loop_2
+
+	ldh a, [hTempCardIndex_ff98]
+	pop bc
+	pop de
+	pop hl
+	scf
+	ret
+
+.no_carry
+	pop bc
+	pop de
+	pop hl
+	or a
+	ret
+
+; play Pokemon cards from the hand to set the starting
+; Play Area of Boss decks.
+; each Boss deck has two ID lists in order of preference.
+; one list is for the Arena card is the other is for the Bench cards.
+; if Arena card could not be set (due to hand not having any card in its list)
+; or if list is null, return carry and do not play any cards.
+TrySetUpBossStartingPlayArea: ; 1581b (5:581b)
+	ld de, wAICardListArenaPriority
+	ld a, d
+	or a
+	jr z, .set_carry ; return if null
+
+; pick Arena card
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld de, wAICardListArenaPriority
+	call .PlayPokemonCardInOrder
+	ret c
+
+; play Pokemon cards to Bench until there are
+; a maximum of 3 cards in Play Area.
+.loop
+	ld de, wAICardListBenchPriority
+	call .PlayPokemonCardInOrder
+	jr c, .done
+	cp 3
+	jr c, .loop
+
+.done
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; runs through input card ID list in de.
+; plays to Play Area first card that is found in hand.
+; returns carry if none of the cards in the list are found.
+; returns number of Pokemon in Play Area in a.
+.PlayPokemonCardInOrder ; 1583f (5:583f)
+	ld a, [de]
+	ld c, a
+	inc de
+	ld a, [de]
+	ld d, a
+	ld e, c
+
+; go in order of the list in de and
+; add first card that matches ID.
+; returns carry if hand doesn't have any card in list.
+.loop_id_list
+	ld a, [de]
+	inc de
+	or a
+	jr z, .not_found
+	push de
+	ld e, a
+	call RemoveCardIDInList
+	pop de
+	jr nc, .loop_id_list
+
+	; play this card to Play Area and return
+	push hl
+	call PutHandPokemonCardInPlayArea
+	pop hl
+	or a
+	ret
+
+.not_found
+	scf
+	ret
+
+; expects a $00-terminated list of 3-byte data with the following:
+; - non-zero value (anything but $1 is ignored)
+; - card ID to look for in Play Area
+; - number of energy cards
+; returns carry if a card ID is found in bench with at least the
+; listed number of energy cards
+; unreferenced
+Func_1585b: ; 1585b (5:585b)
+	ld a, [hli]
+	or a
+	jr z, .no_carry
+	dec a
+	jr nz, .next_1
+	ld a, [hli]
+	ld b, PLAY_AREA_BENCH_1
+	push hl
+	call LookForCardIDInPlayArea_Bank5
+	jr nc, .next_2
+	ld e, a
+	push de
+	call CountNumberOfEnergyCardsAttached
+	pop de
+	pop hl
+	ld b, [hl]
+	cp b
+	jr nc, .set_carry
+	inc hl
+	jr Func_1585b
+
+.next_1
+	inc hl
+	inc hl
+	jr Func_1585b
+
+.next_2
+	pop hl
+	inc hl
+	jr Func_1585b
+
+.no_carry
+	or a
+	ret
+
+.set_carry
+	ld a, e
+	scf
+	ret
+
+; expects a $00-terminated list of 3-byte data with the following:
+; - non-zero value
+; - card ID
+; - number of energy cards
+; goes through the given list and if a card with a listed ID is found
+; with less than the number of energy cards corresponding to its entry
+; then have AI try to play an energy card from the hand to it
+; unreferenced
+Func_15886: ; 15886 (5:5886)
+	push hl
+	call CreateEnergyCardListFromHand
+	pop hl
+	ret c ; quit if no energy cards in hand
+
+.loop_energy_cards
+	ld a, [hli]
+	or a
+	ret z ; done
+	ld a, [hli]
+	ld b, PLAY_AREA_ARENA
+	push hl
+	call LookForCardIDInPlayArea_Bank5
+	jr nc, .next ; skip if not found in Play Area
+	ld e, a
+	push de
+	call CountNumberOfEnergyCardsAttached
+	pop de
+	pop hl
+	cp [hl]
+	inc hl
+	jr nc, .loop_energy_cards
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	push hl
+	call AITryToPlayEnergyCard
+	pop hl
+	ret c
+	jr .loop_energy_cards
+.next
+	pop hl
+	inc hl
+	jr .loop_energy_cards
+
+INCLUDE "engine/ai/retreat.asm"
+
+; Copy cards from wDuelTempList in hl to wHandTempList in de
+CopyHandCardList: ; 15ea6 (5:5ea6)
+	ld a, [hli]
+	ld [de], a
+	cp $ff
+	ret z
+	inc de
+	jr CopyHandCardList
+
+INCLUDE "engine/ai/hand_pokemon.asm"
+
+; check if player's active Pokémon is Mr Mime
+; if it isn't, set carry
+; if it is, check if Pokémon at a
+; can damage it, and if it can, set carry
+; input:
+;	a = location of Pokémon card
+CheckDamageToMrMime: ; 16270 (5:6270)
+	push af
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MR_MIME
+	pop bc
+	jr nz, .set_carry
+	ld a, b
+	call CheckIfCanDamageDefendingPokemon
+	jr c, .set_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; returns carry if arena card
+; can knock out defending Pokémon
+CheckIfActiveCardCanKnockOut: ; 1628f (5:628f)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .fail
+	call CheckIfSelectedAttackIsUnusable
+	jp c, .fail
+	scf
+	ret
+
+.fail
+	or a
+	ret
+
+; outputs carry if any of the active Pokémon attacks
+; can be used and are not residual
+CheckIfActivePokemonCanUseAnyNonResidualAttack: ; 162a1 (5:62a1)
+	xor a ; active card
+	ldh [hTempPlayAreaLocation_ff9d], a
+; first atk
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .next_atk
+	ld a, [wLoadedAttackCategory]
+	and RESIDUAL
+	jr z, .ok
+
+.next_atk
+; second atk
+	ld a, $01
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .fail
+	ld a, [wLoadedAttackCategory]
+	and RESIDUAL
+	jr z, .ok
+.fail
+	or a
+	ret
+
+.ok
+	scf
+	ret
+
+; looks for energy card(s) in hand depending on
+; what is needed for selected card, for both attacks
+;	- if one basic energy is required, look for that energy;
+;	- if one colorless is required, create a list at wDuelTempList
+;	  of all energy cards;
+;	- if two colorless are required, look for double colorless;
+; return carry if successful in finding card
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of Pokémon card
+LookForEnergyNeededInHand: ; 162c8 (5:62c8)
+	xor a ; first attack
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	ld a, b
+	add c
+	cp 1
+	jr z, .one_energy
+	cp 2
+	jr nz, .second_attack
+	ld a, c
+	cp 2
+	jr z, .two_colorless
+
+.second_attack
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	ld a, b
+	add c
+	cp 1
+	jr z, .one_energy
+	cp 2
+	jr nz, .no_carry
+	ld a, c
+	cp 2
+	jr z, .two_colorless
+.no_carry
+	or a
+	ret
+
+.one_energy
+	ld a, b
+	or a
+	jr z, .one_colorless
+	ld a, e
+	call LookForCardIDInHandList_Bank5
+	ret c
+	jr .no_carry
+
+.one_colorless
+	call CreateEnergyCardListFromHand
+	jr c, .no_carry
+	scf
+	ret
+
+.two_colorless
+	ld a, DOUBLE_COLORLESS_ENERGY
+	call LookForCardIDInHandList_Bank5
+	ret c
+	jr .no_carry
+
+; looks for energy card(s) in hand depending on
+; what is needed for selected card and attack
+;	- if one basic energy is required, look for that energy;
+;	- if one colorless is required, create a list at wDuelTempList
+;	  of all energy cards;
+;	- if two colorless are required, look for double colorless;
+; return carry if successful in finding card
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of Pokémon card
+;	[wSelectedAttack]         = selected attack to examine
+LookForEnergyNeededForAttackInHand: ; 16311 (5:6311)
+	call CheckEnergyNeededForAttack
+	ld a, b
+	add c
+	cp 1
+	jr z, .one_energy
+	cp 2
+	jr nz, .done
+	ld a, c
+	cp 2
+	jr z, .two_colorless
+.done
+	or a
+	ret
+
+.one_energy
+	ld a, b
+	or a
+	jr z, .one_colorless
+	ld a, e
+	call LookForCardIDInHandList_Bank5
+	ret c
+	jr .done
+
+.one_colorless
+	call CreateEnergyCardListFromHand
+	jr c, .done
+	scf
+	ret
+
+.two_colorless
+	ld a, DOUBLE_COLORLESS_ENERGY
+	call LookForCardIDInHandList_Bank5
+	ret c
+	jr .done
+
+; goes through $00 terminated list pointed
+; by wAICardListPlayFromHandPriority and compares it to each card in hand.
+; Sorts the hand in wDuelTempList so that the found card IDs
+; are in the same order as the list pointed by de.
+SortTempHandByIDList: ; 1633f (5:633f)
+	ld a, [wAICardListPlayFromHandPriority+1]
+	or a
+	ret z ; return if list is empty
+
+; start going down the ID list
+	ld d, a
+	ld a, [wAICardListPlayFromHandPriority]
+	ld e, a
+	ld c, 0
+.loop_list_id
+; get this item's ID
+; if $00, list has ended
+	ld a, [de]
+	or a
+	ret z ; return when list is over
+	inc de
+	ld hl, wDuelTempList
+	ld b, 0
+	add hl, bc
+	ld b, a
+
+; search in the hand card list
+.next_hand_card
+	ld a, [hl]
+	ldh [hTempCardIndex_ff98], a
+	cp -1
+	jr z, .loop_list_id
+	push bc
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	pop bc
+	cp b
+	jr nz, .not_same
+
+; found
+; swap this hand card with the spot
+; in hand corresponding to c
+	push bc
+	push hl
+	ld b, 0
+	ld hl, wDuelTempList
+	add hl, bc
+	ld b, [hl]
+	ldh a, [hTempCardIndex_ff98]
+	ld [hl], a
+	pop hl
+	ld [hl], b
+	pop bc
+	inc c
+.not_same
+	inc hl
+	jr .next_hand_card
+
+; looks for energy card(s) in list at wDuelTempList
+; depending on energy flags set in a
+; return carry if successful in finding card
+; input:
+;	a = energy flags needed
+CheckEnergyFlagsNeededInList: ; 1637b (5:637b)
+	ld e, a
+	ld hl, wDuelTempList
+.next_card
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+
+; fire
+	cp FIRE_ENERGY
+	jr nz, .grass
+	ld a, FIRE_F
+	jr .check_energy
+.grass
+	cp GRASS_ENERGY
+	jr nz, .lightning
+	ld a, GRASS_F
+	jr .check_energy
+.lightning
+	cp LIGHTNING_ENERGY
+	jr nz, .water
+	ld a, LIGHTNING_F
+	jr .check_energy
+.water
+	cp WATER_ENERGY
+	jr nz, .fighting
+	ld a, WATER_F
+	jr .check_energy
+.fighting
+	cp FIGHTING_ENERGY
+	jr nz, .psychic
+	ld a, FIGHTING_F
+	jr .check_energy
+.psychic
+	cp PSYCHIC_ENERGY
+	jr nz, .colorless
+	ld a, PSYCHIC_F
+	jr .check_energy
+.colorless
+	cp DOUBLE_COLORLESS_ENERGY
+	jr nz, .next_card
+	ld a, COLORLESS_F
+
+; if energy card matches required energy, return carry
+.check_energy
+	ld d, e
+	and e
+	ld e, d
+	jr z, .next_card
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; returns in a the energy cost of both attacks from card index in a
+; represented by energy flags
+; i.e. each bit represents a different energy type cost
+; if any colorless energy is required, all bits are set
+; input:
+;	a = card index
+; output:
+;	a = bits of each energy requirement
+GetAttacksEnergyCostBits: ; 163c9 (5:63c9)
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld hl, wLoadedCard2Atk1EnergyCost
+	call GetEnergyCostBits
+	ld b, a
+
+	push bc
+	ld hl, wLoadedCard2Atk2EnergyCost
+	call GetEnergyCostBits
+	pop bc
+	or b
+	ret
+
+; returns in a the energy cost of an attack in [hl]
+; represented by energy flags
+; i.e. each bit represents a different energy type cost
+; if any colorless energy is required, all bits are set
+; input:
+;	[hl] = Loaded card attack energy cost
+; output:
+;	a = bits of each energy requirement
+GetEnergyCostBits: ; 163dd (5:63dd)
+	ld c, $00
+	ld a, [hli]
+	ld b, a
+
+; fire
+	and $f0
+	jr z, .grass
+	ld c, FIRE_F
+.grass
+	ld a, b
+	and $0f
+	jr z, .lightning
+	ld a, GRASS_F
+	or c
+	ld c, a
+.lightning
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .water
+	ld a, LIGHTNING_F
+	or c
+	ld c, a
+.water
+	ld a, b
+	and $0f
+	jr z, .fighting
+	ld a, WATER_F
+	or c
+	ld c, a
+.fighting
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .psychic
+	ld a, FIGHTING_F
+	or c
+	ld c, a
+.psychic
+	ld a, b
+	and $0f
+	jr z, .colorless
+	ld a, PSYCHIC_F
+	or c
+	ld c, a
+.colorless
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .done
+	ld a, %11111111
+	or c ; unnecessary
+	ld c, a
+.done
+	ld a, c
+	ret
+
+; set carry flag if any card in
+; wDuelTempList evolves card index in a
+; if found, the evolution card index is returned in a
+; input:
+;	a = card index to check evolution
+; output:
+;	a = card index of evolution found
+CheckForEvolutionInList: ; 16422 (5:6422)
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+
+	push af
+	ld [hl], b
+	ld hl, wDuelTempList
+.loop
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+	push de
+	push hl
+	call CheckIfCanEvolveInto
+	pop hl
+	pop de
+	jr c, .loop
+
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, d
+	scf
+	ret
+
+.no_carry
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	or a
+	ret
+
+; set carry if it finds an evolution for
+; the card index in a in the deck
+; if found, return that evolution card index in a
+; input:
+;	a = card index to check evolution
+; output:
+;	a = card index of evolution found
+CheckForEvolutionInDeck: ; 16451 (5:6451)
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+
+	push af
+	ld [hl], b
+	ld e, 0
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp CARD_LOCATION_DECK
+	jr nz, .not_in_deck
+	push de
+	ld d, e
+	ld e, PLAY_AREA_ARENA
+	call CheckIfCanEvolveInto
+	pop de
+	jr nc, .set_carry
+
+; exit when it gets to the prize cards
+.not_in_deck
+	inc e
+	ld a, DUELVARS_PRIZE_CARDS
+	cp e
+	jr nz, .loop
+
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	or a
+	ret
+
+.set_carry
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, e
+	scf
+	ret
+
+INCLUDE "engine/ai/energy.asm"
+
+INCLUDE "engine/ai/attacks.asm"
+
+INCLUDE "engine/ai/special_attacks.asm"
+
+; checks in other Play Area for non-basic cards.
+; afterwards, that card is checked for damage,
+; and if the damage counters it has is greater than or equal
+; to the max HP of the card stage below it,
+; return carry and that card's Play Area location in a.
+; output:
+;	a = card location of Pokémon card, if found;
+;	carry set if such a card is found.
+LookForCardThatIsKnockedOutOnDevolution: ; 17080 (5:7080)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	push af
+	call SwapTurn
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, PLAY_AREA_ARENA
+
+.loop
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	push bc
+	bank1call GetCardOneStageBelow
+	pop bc
+	jr c, .next
+	; is not a basic card
+	; compare its HP with current damage
+	ld a, d
+	push bc
+	call LoadCardDataToBuffer2_FromDeckIndex
+	pop bc
+	ld a, [wLoadedCard2HP]
+	ld [wTempAI], a
+	ld e, c
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	ld e, a
+	ld a, [wTempAI]
+	cp e
+	jr c, .set_carry
+	jr z, .set_carry
+.next
+	inc c
+	ld a, c
+	cp b
+	jr nz, .loop
+
+	call SwapTurn
+	pop af
+	ldh [hTempPlayAreaLocation_ff9d], a
+	or a
+	ret
+
+.set_carry
+	call SwapTurn
+	pop af
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, c
+	scf
+	ret
+
+; returns carry if the following conditions are met:
+;	- arena card HP >= half max HP
+;	- arena card Unknown2's 4 bit is not set or
+;	  is set but there's no evolution of card in hand/deck
+;	- arena card can use second attack
+CheckIfArenaCardIsAtHalfHPCanEvolveAndUseSecondAttack: ; 170c9 (5:70c9)
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	push de
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wLoadedCard1HP]
+	rrca
+	cp d
+	pop de
+	jr nc, .no_carry
+
+	ld a, [wLoadedCard1Unknown2]
+	and %00010000
+	jr z, .check_second_attack
+	ld a, d
+	call CheckCardEvolutionInHandOrDeck
+	jr c, .no_carry
+
+.check_second_attack
+	xor a ; active card
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	push hl
+	call CheckIfSelectedAttackIsUnusable
+	pop hl
+	jr c, .no_carry
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; count Pokemon in the Bench that
+; meet the following conditions:
+;	- card HP > half max HP
+;	- card Unknown2's 4 bit is not set or
+;	  is set but there's no evolution of card in hand/deck
+;	- card can use second attack
+; Outputs the number of Pokémon in bench
+; that meet these requirements in a
+; and returns carry if at least one is found
+CountNumberOfSetUpBenchPokemon: ; 17101 (5:7101)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	push de
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	lb bc, 0, 0
+	push hl
+
+.next
+	inc c
+	pop hl
+	ld a, [hli]
+	push hl
+	cp $ff
+	jr z, .done
+
+	ld d, a
+	push de
+	push bc
+	call LoadCardDataToBuffer1_FromDeckIndex
+	pop bc
+
+; compares card's current HP with max HP
+	ld a, c
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wLoadedCard1HP]
+	rrca
+
+; a = max HP / 2
+; d = current HP
+; jumps if (current HP) <= (max HP / 2)
+	cp d
+	pop de
+	jr nc, .next
+
+	ld a, [wLoadedCard1Unknown2]
+	and $10
+	jr z, .check_second_attack
+
+	ld a, d
+	push bc
+	call CheckCardEvolutionInHandOrDeck
+	pop bc
+	jr c, .next
+
+.check_second_attack
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	push bc
+	push hl
+	call CheckIfSelectedAttackIsUnusable
+	pop hl
+	pop bc
+	jr c, .next
+	inc b
+	jr .next
+
+.done
+	pop hl
+	pop de
+	ld a, e
+	ld [wSelectedAttack], a
+	ld a, d
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, b
+	or a
+	ret z
+	scf
+	ret
+
+; handles AI logic to determine some selections regarding certain attacks,
+; if any of these attacks were chosen to be used.
+; returns carry if selection was successful,
+; and no carry if unable to make one.
+; outputs in hTempPlayAreaLocation_ffa1 the chosen parameter.
+AISelectSpecialAttackParameters: ; 17161 (5:7161)
+	ld a, [wSelectedAttack]
+	push af
+	call .SelectAttackParameters
+	pop bc
+	ld a, b
+	ld [wSelectedAttack], a
+	ret
+
+.SelectAttackParameters: ; 1716e (5:716e)
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp MEW3
+	jr z, .DevolutionBeam
+	cp MEWTWO3
+	jr z, .EnergyAbsorption
+	cp MEWTWO2
+	jr z, .EnergyAbsorption
+	cp EXEGGUTOR
+	jr z, .Teleport
+	cp ELECTRODE1
+	jr z, .EnergySpike
+	; fallthrough
+
+.no_carry
+	or a
+	ret
+
+.DevolutionBeam
+; in case selected attack is Devolution Beam
+; store in hTempPlayAreaLocation_ffa1
+; the location of card to select to devolve
+	ld a, [wSelectedAttack]
+	or a
+	jp z, .no_carry ; can be jr
+
+	ld a, $01
+	ldh [hTemp_ffa0], a
+	call LookForCardThatIsKnockedOutOnDevolution
+	ldh [hTempPlayAreaLocation_ffa1], a
+
+.set_carry_1
+	scf
+	ret
+
+.EnergyAbsorption
+; in case selected attack is Energy Absorption
+; make list from energy cards in Discard Pile
+	ld a, [wSelectedAttack]
+	or a
+	jp nz, .no_carry  ; can be jr
+
+	ld a, $ff
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ldh [hTempRetreatCostCards], a
+
+; search for Psychic energy cards in Discard Pile
+	ld e, PSYCHIC_ENERGY
+	ld a, CARD_LOCATION_DISCARD_PILE
+	call CheckIfAnyCardIDinLocation
+	ldh [hTemp_ffa0], a
+	farcall CreateEnergyCardListFromDiscardPile_AllEnergy
+
+; find any energy card different from
+; the one found by CheckIfAnyCardIDinLocation.
+; since using this attack requires a Psychic energy card,
+; and another one is in hTemp_ffa0,
+; then any other energy card would account
+; for the Energy Cost of Psyburn.
+	ld hl, wDuelTempList
+.loop_energy_cards
+	ld a, [hli]
+	cp $ff
+	jr z, .set_carry_2
+	ld b, a
+	ldh a, [hTemp_ffa0]
+	cp b
+	jr z, .loop_energy_cards ; same card, keep looking
+
+; store the deck index of energy card found
+	ld a, b
+	ldh [hTempPlayAreaLocation_ffa1], a
+	; fallthrough
+
+.set_carry_2
+	scf
+	ret
+
+.Teleport
+; in case selected attack is Teleport
+; decide Bench card to switch to.
+	ld a, [wSelectedAttack]
+	or a
+	jp nz, .no_carry  ; can be jr
+	call AIDecideBenchPokemonToSwitchTo
+	jr c, .no_carry
+	ldh [hTemp_ffa0], a
+	scf
+	ret
+
+.EnergySpike
+; in case selected attack is Energy Spike
+; decide basic energy card to fetch from Deck.
+	ld a, [wSelectedAttack]
+	or a
+	jp z, .no_carry  ; can be jr
+
+	ld a, CARD_LOCATION_DECK
+	ld e, LIGHTNING_ENERGY
+
+; if none were found in Deck, return carry...
+	call CheckIfAnyCardIDinLocation
+	ldh [hTemp_ffa0], a
+	jp nc, .no_carry  ; can be jr
+
+; ...else find a suitable Play Area Pokemon to
+; attach the energy card to.
+	call AIProcessButDontPlayEnergy_SkipEvolution
+	jp nc, .no_carry  ; can be jr
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	scf
+	ret
+
+; return carry if Pokémon at play area location
+; in hTempPlayAreaLocation_ff9d does not have
+; energy required for the attack index in wSelectedAttack
+; or has exactly the same amount of energy needed
+; input:
+;	[hTempPlayAreaLocation_ff9d] = play area location
+;	[wSelectedAttack]         = attack index to check
+; output:
+;	a = number of extra energy cards attached
+CheckIfNoSurplusEnergyForAttack: ; 171fb (5:71fb)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld hl, wLoadedAttackName
+	ld a, [hli]
+	or [hl]
+	jr z, .not_attack
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr nz, .is_attack
+.not_attack
+	scf
+	ret
+
+.is_attack
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	bank1call HandleEnergyBurn
+	xor a
+	ld [wTempLoadedAttackEnergyCost], a
+	ld [wTempLoadedAttackEnergyNeededAmount], a
+	ld [wTempLoadedAttackEnergyNeededType], a
+	ld hl, wAttachedEnergies
+	ld de, wLoadedAttackEnergyCost
+	ld b, 0
+	ld c, (NUM_TYPES / 2) - 1
+.loop
+	; check all basic energy cards except colorless
+	ld a, [de]
+	swap a
+	call CalculateParticularAttachedEnergyNeeded
+	ld a, [de]
+	call CalculateParticularAttachedEnergyNeeded
+	inc de
+	dec c
+	jr nz, .loop
+
+	; colorless
+	ld a, [de]
+	swap a
+	and %00001111
+	ld b, a
+	ld hl, wTempLoadedAttackEnergyCost
+	ld a, [wTotalAttachedEnergies]
+	sub [hl]
+	sub b
+	ret c ; return if not enough energy
+
+	or a
+	ret nz ; return if surplus energy
+
+	; exactly the amount of energy needed
+	scf
+	ret
+
+; takes as input the energy cost of an attack for a
+; particular energy, stored in the lower nibble of a
+; if the attack costs some amount of this energy, the lower nibble of a != 0,
+; and this amount is stored in wTempLoadedAttackEnergyCost
+; also adds the amount of energy still needed
+; to wTempLoadedAttackEnergyNeededAmount
+; input:
+;	a    = this energy cost of attack (lower nibble)
+;	[hl] = attached energy
+; output:
+;	carry set if not enough of this energy type attached
+CalculateParticularAttachedEnergyNeeded: ; 17258 (5:7258)
+	and %00001111
+	jr nz, .check
+.done
+	inc hl
+	inc b
+	ret
+
+.check
+	ld [wTempLoadedAttackEnergyCost], a
+	sub [hl]
+	jr z, .done
+	jr nc, .done
+	push bc
+	ld a, [wTempLoadedAttackEnergyCost]
+	ld b, a
+	ld a, [hl]
+	sub b
+	pop bc
+	ld [wTempLoadedAttackEnergyNeededAmount], a
+	jr .done
+
+; return carry if there is a card that
+; can evolve a Pokémon in hand or deck.
+; input:
+;	a = deck index of card to check;
+; output:
+;	a = deck index of evolution in hand, if found;
+;	carry set if there's a card in hand that can evolve.
+CheckCardEvolutionInHandOrDeck: ; 17274 (5:7274)
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	push af
+	ld [hl], b
+	ld e, 0
+
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp CARD_LOCATION_DECK
+	jr z, .deck_or_hand
+	cp CARD_LOCATION_HAND
+	jr nz, .next
+.deck_or_hand
+	push de
+	ld d, e
+	ld e, PLAY_AREA_ARENA
+	call CheckIfCanEvolveInto
+	pop de
+	jr nc, .set_carry
+.next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop
+
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	or a
+	ret
+
+.set_carry
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, e
+	scf
+	ret
+
+INCLUDE "engine/ai/boss_deck_set_up.asm"
+
+; returns carry if Pokemon at PLAY_AREA* in a
+; can damage defending Pokémon with any of its attacks
+; input:
+;	a = location of card to check
+CheckIfCanDamageDefendingPokemon: ; 17383 (5:7383)
+	ldh [hTempPlayAreaLocation_ff9d], a
+	xor a ; first attack
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .second_attack
+	xor a
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr nz, .set_carry
+
+.second_attack
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .no_carry
+	ld a, $01
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr nz, .set_carry
+
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; checks if defending Pokémon can knock out
+; card at hTempPlayAreaLocation_ff9d with any of its attacks
+; and if so, stores the damage to wce00 and wce01
+; sets carry if any on the attacks knocks out
+; also outputs the largest damage dealt in a
+; input:
+;	[hTempPlayAreaLocation_ff9d] = location of card to check
+; output:
+;	a = largest damage of both attacks
+;	carry set if can knock out
+CheckIfDefendingPokemonCanKnockOut: ; 173b1 (5:73b1)
+	xor a ; first attack
+	ld [wce00], a
+	ld [wce01], a
+	call CheckIfDefendingPokemonCanKnockOutWithAttack
+	jr nc, .second_attack
+	ld a, [wDamage]
+	ld [wce00], a
+
+.second_attack
+	ld a, SECOND_ATTACK
+	call CheckIfDefendingPokemonCanKnockOutWithAttack
+	jr nc, .return_if_neither_kos
+	ld a, [wDamage]
+	ld [wce01], a
+	jr .compare
+
+.return_if_neither_kos
+	ld a, [wce00]
+	or a
+	ret z
+
+.compare
+	ld a, [wce00]
+	ld b, a
+	ld a, [wce01]
+	cp b
+	jr nc, .set_carry
+	ld a, b
+.set_carry
+	scf
+	ret
+
+; return carry if defending Pokémon can knock out
+; card at hTempPlayAreaLocation_ff9d
+; input:
+;	a = attack index
+;	[hTempPlayAreaLocation_ff9d] = location of card to check
+CheckIfDefendingPokemonCanKnockOutWithAttack: ; 173e4 (5:73e4)
+	ld [wSelectedAttack], a
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	push af
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call SwapTurn
+	call CheckIfSelectedAttackIsUnusable
+	call SwapTurn
+	pop bc
+	ld a, b
+	ldh [hTempPlayAreaLocation_ff9d], a
+	jr c, .done
+
+; player's active Pokémon can use attack
+	ld a, [wSelectedAttack]
+	call EstimateDamage_FromDefendingPokemon
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jr z, .set_carry
+	ret
+
+.set_carry
+	scf
+	ret
+
+.done
+	or a
+	ret
+
+; sets carry if Opponent's deck ID
+; is between LEGENDARY_MOLTRES_DECK_ID (inclusive)
+; and MUSCLES_FOR_BRAINS_DECK_ID (exclusive)
+; these are the decks for Grandmaster/Club Master/Ronald
+CheckIfOpponentHasBossDeckID: ; 17414 (5:7414)
+	push af
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_MOLTRES_DECK_ID
+	jr c, .no_carry
+	cp MUSCLES_FOR_BRAINS_DECK_ID
+	jr nc, .no_carry
+	pop af
+	scf
+	ret
+
+.no_carry
+	pop af
+	or a
+	ret
+
+; sets carry if not a boss fight
+; and if hasn't received legendary cards yet
+CheckIfNotABossDeckID: ; 17426 (5:7426)
+	call EnableSRAM
+	ld a, [sReceivedLegendaryCards]
+	call DisableSRAM
+	or a
+	jr nz, .no_carry
+	call CheckIfOpponentHasBossDeckID
+	jr nc, .set_carry
+.no_carry
+	or a
+	ret
+
+.set_carry
+	scf
+	ret
+
+; probability to return carry:
+; - 50% if deck AI is playing is on the list;
+; - 25% for all other decks;
+; - 0% for boss decks.
+; used for certain decks to randomly choose
+; not to play Trainer card or use PKMN Power
+AIChooseRandomlyNotToDoAction: ; 1743b (5:743b)
+; boss decks always use Trainer cards.
+	push hl
+	push de
+	call CheckIfNotABossDeckID
+	jr c, .check_deck
+	pop de
+	pop hl
+	ret
+
+.check_deck
+	ld a, [wOpponentDeckID]
+	cp MUSCLES_FOR_BRAINS_DECK_ID
+	jr z, .carry_50_percent
+	cp BLISTERING_POKEMON_DECK_ID
+	jr z, .carry_50_percent
+	cp WATERFRONT_POKEMON_DECK_ID
+	jr z, .carry_50_percent
+	cp BOOM_BOOM_SELFDESTRUCT_DECK_ID
+	jr z, .carry_50_percent
+	cp KALEIDOSCOPE_DECK_ID
+	jr z, .carry_50_percent
+	cp RESHUFFLE_DECK_ID
+	jr z, .carry_50_percent
+
+; carry 25 percent
+	ld a, 4
+	call Random
+	cp 1
+	pop de
+	pop hl
+	ret
+
+.carry_50_percent
+	ld a, 4
+	call Random
+	cp 2
+	pop de
+	pop hl
+	ret
+
+; checks if any bench Pokémon has same ID
+; as input, and sets carry if it has more than
+; half health and can use its second attack
+; input:
+;	a = card ID to check for
+; output:
+;	carry set if the above requirements are met
+CheckForBenchIDAtHalfHPAndCanUseSecondAttack: ; 17474 (5:7474)
+	ld [wcdf9], a
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld d, a
+	ld a, [wSelectedAttack]
+	ld e, a
+	push de
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	lb bc, 0, PLAY_AREA_ARENA
+	push hl
+
+.loop
+	inc c
+	pop hl
+	ld a, [hli]
+	push hl
+	cp $ff
+	jr z, .done
+	ld d, a
+	push de
+	push bc
+	call LoadCardDataToBuffer1_FromDeckIndex
+	pop bc
+	ld a, c
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld d, a
+	ld a, [wLoadedCard1HP]
+	rrca
+	cp d
+	pop de
+	jr nc, .loop
+	; half max HP < current HP
+	ld a, [wLoadedCard1ID]
+	ld hl, wcdf9
+	cp [hl]
+	jr nz, .loop
+
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	push bc
+	call CheckIfSelectedAttackIsUnusable
+	pop bc
+	jr c, .loop
+	inc b
+.done
+	pop hl
+	pop de
+	ld a, e
+	ld [wSelectedAttack], a
+	ld a, d
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, b
+	or a
+	ret z
+	scf
+	ret
+
+; add 5 to wPlayAreaEnergyAIScore AI score corresponding to all cards
+; in bench that have same ID as register a
+; input:
+;	a = card ID to look for
+RaiseAIScoreToAllMatchingIDsInBench: ; 174cd (5:74cd)
+	ld d, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld e, 0
+.loop
+	inc e
+	ld a, [hli]
+	cp $ff
+	ret z
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp d
+	jr nz, .loop
+	ld c, e
+	ld b, $00
+	push hl
+	ld hl, wPlayAreaEnergyAIScore
+	add hl, bc
+	ld a, 5
+	add [hl]
+	ld [hl], a
+	pop hl
+	jr .loop
+
+; goes through each play area Pokémon, and
+; for all cards of the same ID, determine which
+; card has highest value calculated from Func_17583
+; the card with highest value gets increased wPlayAreaEnergyAIScore
+; while all others get decreased wPlayAreaEnergyAIScore
+Func_174f2: ; 174f2 (5:74f2)
+	ld a, MAX_PLAY_AREA_POKEMON
+	ld hl, wcdfa
+	call ClearMemory_Bank5
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld e, 0
+
+.loop_play_area
+	push hl
+	ld a, MAX_PLAY_AREA_POKEMON
+	ld hl, wcdea
+	call ClearMemory_Bank5
+	pop hl
+	inc e
+	ld a, [hli]
+	cp $ff
+	ret z
+
+	ld [wcdf9], a
+	push de
+	push hl
+
+; checks wcdfa + play area location in e
+; if != 0, go to next in play area
+	ld d, $00
+	ld hl, wcdfa
+	add hl, de
+	ld a, [hl]
+	or a
+	pop hl
+	pop de
+	jr nz, .loop_play_area
+
+; loads wcdf9 with card ID
+; and call Func_17583
+	push de
+	ld a, [wcdf9]
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wcdf9], a
+	pop de
+	push hl
+	push de
+	call Func_17583
+
+; check play area Pokémon ahead
+; if there is a card with the same ID,
+; call Func_17583 for it as well
+.loop_1
+	inc e
+	ld a, [hli]
+	cp $ff
+	jr z, .check_if_repeated_id
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, [wcdf9]
+	cp e
+	pop de
+	jr nz, .loop_1
+	call Func_17583
+	jr .loop_1
+
+; if there are more than 1 of the same ID
+; in play area, iterate bench backwards
+; and determines which card has highest
+; score in wcdea
+.check_if_repeated_id
+	call Func_175a8
+	jr c, .next
+	lb bc, 0, 0
+	ld hl, wcdea + MAX_BENCH_POKEMON
+	ld d, MAX_PLAY_AREA_POKEMON
+.loop_2
+	dec d
+	jr z, .asm_17560
+	ld a, [hld]
+	cp b
+	jr c, .loop_2
+	ld b, a
+	ld c, d
+	jr .loop_2
+
+; c = play area location of highest score
+; decrease wPlayAreaEnergyAIScore score for all cards with same ID
+; except for the one with highest score
+; increase wPlayAreaEnergyAIScore score for card with highest ID
+.asm_17560
+	ld hl, wPlayAreaEnergyAIScore
+	ld de, wcdea
+	ld b, PLAY_AREA_ARENA
+.loop_3
+	ld a, c
+	cp b
+	jr z, .card_with_highest
+	ld a, [de]
+	or a
+	jr z, .check_next
+; decrease score
+	dec [hl]
+	jr .check_next
+.card_with_highest
+; increase score
+	inc [hl]
+.check_next
+	inc b
+	ld a, MAX_PLAY_AREA_POKEMON
+	cp b
+	jr z, .next
+	inc de
+	inc hl
+	jr .loop_3
+
+.next
+	pop de
+	pop hl
+	jp .loop_play_area
+
+; loads wcdea + play area location in e
+; with energy  * 2 + $80 - floor(dam / 10)
+; loads wcdfa + play area location in e
+; with $01
+Func_17583: ; 17583 (5:7583)
+	push hl
+	push de
+	call GetCardDamageAndMaxHP
+	call CalculateByteTensDigit
+	ld b, a
+	push bc
+	call CountNumberOfEnergyCardsAttached
+	pop bc
+	sla a
+	add $80
+	sub b
+	pop de
+	push de
+	ld d, $00
+	ld hl, wcdea
+	add hl, de
+	ld [hl], a
+	ld hl, wcdfa
+	add hl, de
+	ld [hl], $01
+	pop de
+	pop hl
+	ret
+
+; counts how many play area locations in wcdea
+; are != 0, and outputs result in a
+; also returns carry if result is < 2
+Func_175a8: ; 175a8 (5:75a8)
+	ld hl, wcdea
+	ld d, $00
+	ld e, MAX_PLAY_AREA_POKEMON + 1
+.loop
+	dec e
+	jr z, .done
+	ld a, [hli]
+	or a
+	jr z, .loop
+	inc d
+	jr .loop
+.done
+	ld a, d
+	cp 2
+	ret
+
+; handle how AI scores giving out Energy Cards
+; when using Legendary Articuno deck
+HandleLegendaryArticunoEnergyScoring: ; 175bd (5:75bd)
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_ARTICUNO_DECK_ID
+	jr z, .articuno_deck
+	ret
+.articuno_deck
+	call ScoreLegendaryArticunoCards
+	ret
diff --git a/src/engine/ai/damage_calculation.asm b/src/engine/ai/damage_calculation.asm
new file mode 100644
index 0000000..a4fcd27
--- /dev/null
+++ b/src/engine/ai/damage_calculation.asm
@@ -0,0 +1,450 @@
+; stores in wDamage, wAIMinDamage and wAIMaxDamage the calculated damage
+; done to the defending Pokémon by a given card and attack
+; input:
+;	a = attack index to take into account
+;	[hTempPlayAreaLocation_ff9d] = location of attacking card to consider
+EstimateDamage_VersusDefendingCard: ; 143e5 (5:43e5)
+	ld [wSelectedAttack], a
+	ld e, a
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr nz, .is_attack
+
+; is a Pokémon Power
+; set wDamage, wAIMinDamage and wAIMaxDamage to zero
+	ld hl, wDamage
+	xor a
+	ld [hli], a
+	ld [hl], a
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+	ld e, a
+	ld d, a
+	ret
+
+.is_attack
+; set wAIMinDamage and wAIMaxDamage to damage of attack
+; these values take into account the range of damage
+; that the attack can span (e.g. min and max number of hits)
+	ld a, [wDamage]
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+	ld a, EFFECTCMDTYPE_AI
+	call TryExecuteEffectCommandFunction
+	ld a, [wAIMinDamage]
+	ld hl, wAIMaxDamage
+	or [hl]
+	jr nz, .calculation
+	ld a, [wDamage]
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+
+.calculation
+; if temp. location is active, damage calculation can be done directly...
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr z, CalculateDamage_VersusDefendingPokemon
+
+; ...otherwise substatuses need to be temporarily reset to account
+; for the switching, to obtain the right damage calculation...
+	; reset substatus1
+	ld a, DUELVARS_ARENA_CARD_SUBSTATUS1
+	call GetTurnDuelistVariable
+	push af
+	push hl
+	ld [hl], $00
+	; reset substatus2
+	ld l, DUELVARS_ARENA_CARD_SUBSTATUS2
+	ld a, [hl]
+	push af
+	push hl
+	ld [hl], $00
+	; reset changed resistance
+	ld l, DUELVARS_ARENA_CARD_CHANGED_RESISTANCE
+	ld a, [hl]
+	push af
+	push hl
+	ld [hl], $00
+	call CalculateDamage_VersusDefendingPokemon
+; ...and subsequently recovered to continue the duel normally
+	pop hl
+	pop af
+	ld [hl], a
+	pop hl
+	pop af
+	ld [hl], a
+	pop hl
+	pop af
+	ld [hl], a
+	ret
+
+; calculates the damage that will be dealt to the player's active card
+; using the card that is located in hTempPlayAreaLocation_ff9d
+; taking into account weakness/resistance/pluspowers/defenders/etc
+; and outputs the result capped at a max of $ff
+; input:
+;	[wAIMinDamage] = base damage
+;	[wAIMaxDamage] = base damage
+;	[wDamage]      = base damage
+;	[hTempPlayAreaLocation_ff9d] = turn holder's card location as the attacker
+CalculateDamage_VersusDefendingPokemon: ; 14453 (5:4453)
+	ld hl, wAIMinDamage
+	call _CalculateDamage_VersusDefendingPokemon
+	ld hl, wAIMaxDamage
+	call _CalculateDamage_VersusDefendingPokemon
+	ld hl, wDamage
+;	fallthrough
+
+_CalculateDamage_VersusDefendingPokemon: ; 14462 (5:4462)
+	ld e, [hl]
+	ld d, $00
+	push hl
+
+	; load this card's data
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2ID]
+	ld [wTempTurnDuelistCardID], a
+
+	; load player's arena card data
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2ID]
+	ld [wTempNonTurnDuelistCardID], a
+	call SwapTurn
+
+	push de
+	call HandleNoDamageOrEffectSubstatus
+	pop de
+	jr nc, .vulnerable
+	; invulnerable to damage
+	ld de, $0
+	jr .done
+.vulnerable
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	call z, HandleDoubleDamageSubstatus
+	; skips the weak/res checks if unaffected.
+	bit UNAFFECTED_BY_WEAKNESS_RESISTANCE_F, d
+	res UNAFFECTED_BY_WEAKNESS_RESISTANCE_F, d
+	jr nz, .not_resistant
+
+; handle weakness
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	call GetPlayAreaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call SwapTurn
+	call GetArenaCardWeakness
+	call SwapTurn
+	and b
+	jr z, .not_weak
+	; double de
+	sla e
+	rl d
+
+.not_weak
+; handle resistance
+	call SwapTurn
+	call GetArenaCardResistance
+	call SwapTurn
+	and b
+	jr z, .not_resistant
+	ld hl, -30
+	add hl, de
+	ld e, l
+	ld d, h
+
+.not_resistant
+	; apply pluspower and defender boosts
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add CARD_LOCATION_ARENA
+	ld b, a
+	call ApplyAttachedPluspower
+	call SwapTurn
+	ld b, CARD_LOCATION_ARENA
+	call ApplyAttachedDefender
+	call HandleDamageReduction
+	; test if de underflowed
+	bit 7, d
+	jr z, .no_underflow
+	ld de, $0
+
+.no_underflow
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and DOUBLE_POISONED
+	jr z, .not_poisoned
+	ld c, 20
+	and DOUBLE_POISONED & (POISONED ^ $ff)
+	jr nz, .add_poison
+	ld c, 10
+.add_poison
+	ld a, c
+	add e
+	ld e, a
+	ld a, $00
+	adc d
+	ld d, a
+.not_poisoned
+	call SwapTurn
+
+.done
+	pop hl
+	ld [hl], e
+	ld a, d
+	or a
+	ret z
+	; cap damage
+	ld a, $ff
+	ld [hl], a
+	ret
+
+; stores in wDamage, wAIMinDamage and wAIMaxDamage the calculated damage
+; done to the Pokémon at hTempPlayAreaLocation_ff9d
+; by the defending Pokémon, using the attack index at a
+; input:
+;	a = attack index
+;	[hTempPlayAreaLocation_ff9d] = location of card to calculate
+;	                               damage as the receiver
+EstimateDamage_FromDefendingPokemon: ; 1450b (5:450b)
+	call SwapTurn
+	ld [wSelectedAttack], a
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	call SwapTurn
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr nz, .is_attack
+
+; is a Pokémon Power
+; set wDamage, wAIMinDamage and wAIMaxDamage to zero
+	ld hl, wDamage
+	xor a
+	ld [hli], a
+	ld [hl], a
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+	ld e, a
+	ld d, a
+	ret
+
+.is_attack
+; set wAIMinDamage and wAIMaxDamage to damage of attack
+; these values take into account the range of damage
+; that the attack can span (e.g. min and max number of hits)
+	ld a, [wDamage]
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+	call SwapTurn
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	push af
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, EFFECTCMDTYPE_AI
+	call TryExecuteEffectCommandFunction
+	pop af
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call SwapTurn
+	ld a, [wAIMinDamage]
+	ld hl, wAIMaxDamage
+	or [hl]
+	jr nz, .calculation
+	ld a, [wDamage]
+	ld [wAIMinDamage], a
+	ld [wAIMaxDamage], a
+
+.calculation
+; if temp. location is active, damage calculation can be done directly...
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr z, CalculateDamage_FromDefendingPokemon
+
+; ...otherwise substatuses need to be temporarily reset to account
+; for the switching, to obtain the right damage calculation...
+	ld a, DUELVARS_ARENA_CARD_SUBSTATUS1
+	call GetTurnDuelistVariable
+	push af
+	push hl
+	ld [hl], $00
+	; reset substatus2
+	ld l, DUELVARS_ARENA_CARD_SUBSTATUS2
+	ld a, [hl]
+	push af
+	push hl
+	ld [hl], $00
+	; reset changed resistance
+	ld l, DUELVARS_ARENA_CARD_CHANGED_RESISTANCE
+	ld a, [hl]
+	push af
+	push hl
+	ld [hl], $00
+	call CalculateDamage_FromDefendingPokemon
+; ...and subsequently recovered to continue the duel normally
+	pop hl
+	pop af
+	ld [hl], a
+	pop hl
+	pop af
+	ld [hl], a
+	pop hl
+	pop af
+	ld [hl], a
+	ret
+
+; similar to CalculateDamage_VersusDefendingPokemon but reversed,
+; calculating damage of the defending Pokémon versus
+; the card located in hTempPlayAreaLocation_ff9d
+; taking into account weakness/resistance/pluspowers/defenders/etc
+; and poison damage for two turns
+; and outputs the result capped at a max of $ff
+; input:
+;	[wAIMinDamage] = base damage
+;	[wAIMaxDamage] = base damage
+;	[wDamage]      = base damage
+;	[hTempPlayAreaLocation_ff9d] = location of card to calculate
+;								 damage as the receiver
+CalculateDamage_FromDefendingPokemon: ; 1458c (5:458c)
+	ld hl, wAIMinDamage
+	call .CalculateDamage
+	ld hl, wAIMaxDamage
+	call .CalculateDamage
+	ld hl, wDamage
+	; fallthrough
+
+.CalculateDamage ; 1459b (5:459b)
+	ld e, [hl]
+	ld d, $00
+	push hl
+
+	; load player active card's data
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2ID]
+	ld [wTempTurnDuelistCardID], a
+	call SwapTurn
+
+	; load opponent's card data
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2ID]
+	ld [wTempNonTurnDuelistCardID], a
+
+	call SwapTurn
+	call HandleDoubleDamageSubstatus
+	bit UNAFFECTED_BY_WEAKNESS_RESISTANCE_F, d
+	res UNAFFECTED_BY_WEAKNESS_RESISTANCE_F, d
+	jr nz, .not_resistant
+
+; handle weakness
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call SwapTurn
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .bench_weak
+	ld a, DUELVARS_ARENA_CARD_CHANGED_WEAKNESS
+	call GetTurnDuelistVariable
+	or a
+	jr nz, .unchanged_weak
+
+.bench_weak
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2Weakness]
+.unchanged_weak
+	and b
+	jr z, .not_weak
+	; double de
+	sla e
+	rl d
+
+.not_weak
+; handle resistance
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .bench_res
+	ld a, DUELVARS_ARENA_CARD_CHANGED_RESISTANCE
+	call GetTurnDuelistVariable
+	or a
+	jr nz, .unchanged_res
+
+.bench_res
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2Resistance]
+.unchanged_res
+	and b
+	jr z, .not_resistant
+	ld hl, -30
+	add hl, de
+	ld e, l
+	ld d, h
+
+.not_resistant
+	; apply pluspower and defender boosts
+	call SwapTurn
+	ld b, CARD_LOCATION_ARENA
+	call ApplyAttachedPluspower
+	call SwapTurn
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add CARD_LOCATION_ARENA
+	ld b, a
+	call ApplyAttachedDefender
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	call z, HandleDamageReduction
+	bit 7, d
+	jr z, .no_underflow
+	ld de, $0
+
+.no_underflow
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .done
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and DOUBLE_POISONED
+	jr z, .done
+	ld c, 40
+	and DOUBLE_POISONED & (POISONED ^ $ff)
+	jr nz, .add_poison
+	ld c, 20
+.add_poison
+	ld a, c
+	add e
+	ld e, a
+	ld a, $00
+	adc d
+	ld d, a
+
+.done
+	pop hl
+	ld [hl], e
+	ld a, d
+	or a
+	ret z
+	ld a, $ff
+	ld [hl], a
+	ret
diff --git a/src/engine/ai/deck_ai.asm b/src/engine/ai/deck_ai.asm
new file mode 100644
index 0000000..c330418
--- /dev/null
+++ b/src/engine/ai/deck_ai.asm
@@ -0,0 +1,82 @@
+; AI card retreat score bonus
+; when the AI retreat routine runs through the Bench to choose
+; a Pokemon to switch to, it looks up in this list and if
+; a card ID matches, applies a retreat score bonus to this card.
+; positive (negative) means more (less) likely to switch to this card.
+ai_retreat: MACRO
+	db \1       ; card ID
+	db $80 + \2 ; retreat score (ranges between -128 and 127)
+ENDM
+
+; AI card energy attach score bonus
+; when the AI energy attachment routine runs through the Play Area to choose
+; a Pokemon to attach an energy card, it looks up in this list and if
+; a card ID matches, skips this card if the maximum number of energy
+; cards attached has been reached. If it hasn't been reached, additionally
+; applies a positive (or negative) AI score to attach energy to this card.
+ai_energy: MACRO
+	db \1       ; card ID
+	db \2       ; maximum number of attached cards
+	db $80 + \3 ; energy score (ranges between -128 and 127)
+ENDM
+
+; stores in WRAM pointer to data in argument
+; e.g. store_list_pointer wSomeListPointer, SomeData
+store_list_pointer: MACRO
+	ld hl, \1
+	ld de, \2
+	ld [hl], e
+	inc hl
+	ld [hl], d
+ENDM
+
+; deck AIs are specialized to work on a given deck ID.
+; they decide what happens during a turn, what Pokemon cards
+; to pick during the start of the duel, etc.
+; the different scenarios these are used are listed in AIACTION_* constants.
+; each of these have a pointer table with the following structure:
+; dw .do_turn       : never called;
+;
+; dw .do_turn       : called to handle the main turn logic, from the beginning
+;                     of the turn up to the attack (or lack thereof);
+;
+; dw .start_duel    : called at the start of the duel to initialize some
+;                     variables and optionally set up CPU hand and deck;
+;
+; dw .forced_switch : logic to determine what Pokemon to pick when there's
+;                     an effect that forces AI to switch to Bench card;
+;
+; dw .ko_switch     : logic for picking which card to use after a KO;
+;
+; dw .take_prize    : logic to decide which prize card to pick.
+
+; optionally, decks can also declare card lists that will add
+; more specialized logic during various generic AI routines,
+; and read during the .start_duel routines.
+; the pointers to these lists are stored in memory:
+; wAICardListAvoidPrize    : list of cards to avoid being placed as prize;
+; wAICardListArenaPriority : priority list of Arena card at duel start;
+; wAICardListBenchPriority : priority list of Bench cards at duel start;
+; wAICardListPlayFromHandPriority : priority list of cards to play from hand;
+; wAICardListRetreatBonus  : scores given to certain cards for retreat;
+; wAICardListEnergyBonus   : max number of energy cards and card scores.
+
+INCLUDE "engine/ai/decks/general.asm"
+INCLUDE "engine/ai/decks/sams_practice.asm"
+INCLUDE "engine/ai/decks/general_no_retreat.asm"
+INCLUDE "engine/ai/decks/legendary_moltres.asm"
+INCLUDE "engine/ai/decks/legendary_zapdos.asm"
+INCLUDE "engine/ai/decks/legendary_articuno.asm"
+INCLUDE "engine/ai/decks/legendary_dragonite.asm"
+INCLUDE "engine/ai/decks/first_strike.asm"
+INCLUDE "engine/ai/decks/rock_crusher.asm"
+INCLUDE "engine/ai/decks/go_go_rain_dance.asm"
+INCLUDE "engine/ai/decks/zapping_selfdestruct.asm"
+INCLUDE "engine/ai/decks/flower_power.asm"
+INCLUDE "engine/ai/decks/strange_psyshock.asm"
+INCLUDE "engine/ai/decks/wonders_of_science.asm"
+INCLUDE "engine/ai/decks/fire_charge.asm"
+INCLUDE "engine/ai/decks/im_ronald.asm"
+INCLUDE "engine/ai/decks/powerful_ronald.asm"
+INCLUDE "engine/ai/decks/invincible_ronald.asm"
+INCLUDE "engine/ai/decks/legendary_ronald.asm"
diff --git a/src/engine/ai/decks/fire_charge.asm b/src/engine/ai/decks/fire_charge.asm
new file mode 100644
index 0000000..f5b347b
--- /dev/null
+++ b/src/engine/ai/decks/fire_charge.asm
@@ -0,0 +1,80 @@
+AIActionTable_FireCharge: ; 15232 (5:5232)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 1523e (5:523e)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 15242 (5:5242)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 15253 (5:5253)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 15257 (5:5257)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 1525b (5:525b)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 1525f (5:525f)
+	db JIGGLYPUFF3
+	db CHANSEY
+	db TAUROS
+	db MAGMAR1
+	db JIGGLYPUFF1
+	db GROWLITHE
+	db $00
+
+.list_bench ; 15266 (5:5266)
+	db JIGGLYPUFF3
+	db CHANSEY
+	db GROWLITHE
+	db MAGMAR1
+	db JIGGLYPUFF1
+	db TAUROS
+	db $00
+
+.list_retreat ; 1526e (5:526e)
+	ai_retreat JIGGLYPUFF1, -1
+	ai_retreat CHANSEY,     -1
+	ai_retreat GROWLITHE,   -1
+	db $00
+
+.list_energy ; 15274 (5:5274)
+	ai_energy GROWLITHE,   3, +0
+	ai_energy ARCANINE2,   4, +0
+	ai_energy MAGMAR1,     3, +0
+	ai_energy JIGGLYPUFF1, 3, +0
+	ai_energy JIGGLYPUFF3, 2, +0
+	ai_energy WIGGLYTUFF,  3, +0
+	ai_energy CHANSEY,     4, +0
+	ai_energy TAUROS,      3, +0
+	db $00
+
+.list_prize ; 1528d (5:528d)
+	db GAMBLER
+	db $00
+
+.store_list_pointers ; 1528f (5:528f)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/first_strike.asm b/src/engine/ai/decks/first_strike.asm
new file mode 100644
index 0000000..2e636e1
--- /dev/null
+++ b/src/engine/ai/decks/first_strike.asm
@@ -0,0 +1,76 @@
+AIActionTable_FirstStrike: ; 14e89 (5:4e89)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14e95 (5:4e95)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 14e99 (5:4e99)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14eaa (5:4eaa)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14eae (5:4eae)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14eb2 (5:4eb2)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14eb6 (5:1eb6)
+	db HITMONCHAN
+	db MACHOP
+	db HITMONLEE
+	db MANKEY
+	db $00
+
+.list_bench ; 14ebb (5:1ebb)
+	db MACHOP
+	db HITMONLEE
+	db HITMONCHAN
+	db MANKEY
+	db $00
+
+.list_retreat ; 14ec0 (5:1ec0)
+	ai_retreat MACHOP,  -1
+	ai_retreat MACHOKE, -1
+	ai_retreat MANKEY,  -2
+	db $00
+
+.list_energy ; 14ec7 (5:1ec7)
+	ai_energy MACHOP,     3, +0
+	ai_energy MACHOKE,    4, +0
+	ai_energy MACHAMP,    4, -1
+	ai_energy HITMONCHAN, 3, +0
+	ai_energy HITMONLEE,  3, +0
+	ai_energy MANKEY,     2, -1
+	ai_energy PRIMEAPE,   3, -1
+	db $00
+
+.list_prize ; 14edd (5:1edd)
+	db HITMONLEE
+	db HITMONCHAN
+	db $00
+
+.store_list_pointers ; 14ee0 (5:4ee0)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/flower_power.asm b/src/engine/ai/decks/flower_power.asm
new file mode 100644
index 0000000..4d423a3
--- /dev/null
+++ b/src/engine/ai/decks/flower_power.asm
@@ -0,0 +1,75 @@
+AIActionTable_FlowerPower: ; 1509b (5:509b)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 150a7 (5:50a7)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 150ab (5:50ab)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 150bc (5:50bc)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 150c0 (5:50c0)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 150c4 (5:50c4)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 150c8 (5:50c8)
+	db ODDISH
+	db EXEGGCUTE
+	db BULBASAUR
+	db $00
+
+.list_bench ; 150cc (5:50cc)
+	db BULBASAUR
+	db EXEGGCUTE
+	db ODDISH
+	db $00
+
+.list_retreat ; 150cf (5:50cf)
+	ai_retreat GLOOM,     -2
+	ai_retreat VILEPLUME, -2
+	ai_retreat BULBASAUR, -2
+	ai_retreat IVYSAUR,   -2
+	db $00
+
+.list_energy ; 150d9 (5:50d9)
+	ai_energy BULBASAUR,  3, +0
+	ai_energy IVYSAUR,    4, +0
+	ai_energy VENUSAUR2,  4, +0
+	ai_energy ODDISH,     2, +0
+	ai_energy GLOOM,      3, -1
+	ai_energy VILEPLUME,  3, -1
+	ai_energy EXEGGCUTE,  3, +0
+	ai_energy EXEGGUTOR, 22, +0
+	db $00
+
+.list_prize ; 150f2 (5:50f2)
+	db VENUSAUR2
+	db $00
+
+.store_list_pointers ; 150f4 (5:50f4)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/general.asm b/src/engine/ai/decks/general.asm
new file mode 100644
index 0000000..039e101
--- /dev/null
+++ b/src/engine/ai/decks/general.asm
@@ -0,0 +1,194 @@
+; AI logic used by general decks
+AIActionTable_GeneralDecks: ; 14668 (05:4668)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14674 (5:4674)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 14678 (5:4678)
+	call InitAIDuelVars
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 1467f (5:467f)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14683 (5:4683)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize: ; 14687 (5:4687)
+	call AIPickPrizeCards
+	ret
+
+; handle AI routines for a whole turn
+AIMainTurnLogic: ; 1468b (5:468b)
+; initialize variables
+	call InitAITurnVars
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; handle Pkmn Powers
+	farcall HandleAIGoGoRainDanceEnergy
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAICowardice
+; process Trainer cards
+; phase 2 through 4.
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_03
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+; process Trainer cards
+; phase 5 through 12.
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_06
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_08
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_12
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_1
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_1
+; play Pokemon from hand again
+	call AIDecidePlayPokemonCard
+; handle Pkmn Powers again
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAIGoGoRainDanceEnergy
+	ld a, AI_ENERGY_TRANS_ATTACK
+	farcall HandleAIEnergyTrans
+; process Trainer cards phases 13 and 15
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_15
+	call AIProcessHandTrainerCards
+; if used Professor Oak, process new hand
+; if not, then proceed to attack.
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PROFESSOR_OAK
+	jr z, .try_attack
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_03
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_06
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_08
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_12
+	call AIProcessHandTrainerCards
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_2
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_2
+	call AIDecidePlayPokemonCard
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAIGoGoRainDanceEnergy
+	ld a, AI_ENERGY_TRANS_ATTACK
+	farcall HandleAIEnergyTrans
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+	; skip AI_TRAINER_CARD_PHASE_15
+.try_attack
+	ld a, AI_ENERGY_TRANS_TO_BENCH
+	farcall HandleAIEnergyTrans
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if AI attacked
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
+
+; handles AI retreating logic
+AIProcessRetreat: ; 14786 (5:4786)
+	ld a, [wAIRetreatedThisTurn]
+	or a
+	ret nz ; return, already retreated this turn
+
+	call AIDecideWhetherToRetreat
+	ret nc ; return if not retreating
+
+	call AIDecideBenchPokemonToSwitchTo
+	ret c ; return if no Bench Pokemon
+
+; store Play Area to retreat to and
+; set wAIRetreatedThisTurn to true
+	ld [wAIPlayAreaCardToSwitch], a
+	ld a, $01
+	ld [wAIRetreatedThisTurn], a
+
+; if AI can use Switch from hand, use it instead...
+	ld a, AI_TRAINER_CARD_PHASE_09
+	call AIProcessHandTrainerCards
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_SWITCH
+	jr nz, .used_switch
+; ... else try retreating normally.
+	ld a, [wAIPlayAreaCardToSwitch]
+	call AITryToRetreat
+	ret
+
+.used_switch
+; if AI used switch, unset its AI flag
+	ld a, [wPreviousAIFlags]
+	and ~AI_FLAG_USED_SWITCH ; clear Switch flag
+	ld [wPreviousAIFlags], a
+
+; bug, this doesn't make sense being here, since at this point
+; Switch Trainer card was already used to retreat the Pokemon.
+; what the routine will do is just transfer Energy cards to
+; the Arena Pokemon for the purpose of retreating, and
+; then not actually retreat, resulting in unusual behaviour.
+; this would only work placed right after the AI checks whether
+; they have Switch card in hand to use and doesn't have one.
+; (and probably that was the original intention.)
+	ld a, AI_ENERGY_TRANS_RETREAT ; retreat
+	farcall HandleAIEnergyTrans
+	ret
diff --git a/src/engine/ai/decks/general_no_retreat.asm b/src/engine/ai/decks/general_no_retreat.asm
new file mode 100644
index 0000000..20d84e3
--- /dev/null
+++ b/src/engine/ai/decks/general_no_retreat.asm
@@ -0,0 +1,140 @@
+; acts just like a general deck AI except never retreats
+AIActionTable_GeneralNoRetreat: ; 148dc (5:48dc)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 148e8 (5:48e8)
+	call AIDoTurn_GeneralNoRetreat
+	ret
+
+.start_duel ; 148ec (5:48ec)
+	call InitAIDuelVars
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 148f3 (5:48f3)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 148f7 (5:48f7)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 148fb (5:48fb)
+	call AIPickPrizeCards
+	ret
+
+AIDoTurn_GeneralNoRetreat: ; 148ff (5:48ff)
+; initialize variables
+	call InitAITurnVars
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; handle Pkmn Powers
+	farcall HandleAIGoGoRainDanceEnergy
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAICowardice
+; process Trainer cards
+; phase 2 through 4.
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_03
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+; process Trainer cards
+; phase 5 through 12.
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_06
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_08
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_12
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_1
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_1
+; play Pokemon from hand again
+	call AIDecidePlayPokemonCard
+; handle Pkmn Powers again
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAIGoGoRainDanceEnergy
+	ld a, AI_ENERGY_TRANS_ATTACK
+	farcall HandleAIEnergyTrans
+; process Trainer cards phases 13 and 15
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_15
+	call AIProcessHandTrainerCards
+; if used Professor Oak, process new hand
+; if not, then proceed to attack.
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PROFESSOR_OAK
+	jr z, .try_attack
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_03
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_06
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_08
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_12
+	call AIProcessHandTrainerCards
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_2
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_2
+	call AIDecidePlayPokemonCard
+	farcall HandleAIDamageSwap
+	farcall HandleAIPkmnPowers
+	ret c ; return if turn ended
+	farcall HandleAIGoGoRainDanceEnergy
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+	; skip AI_TRAINER_CARD_PHASE_15
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if turn ended
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/go_go_rain_dance.asm b/src/engine/ai/decks/go_go_rain_dance.asm
new file mode 100644
index 0000000..23547e2
--- /dev/null
+++ b/src/engine/ai/decks/go_go_rain_dance.asm
@@ -0,0 +1,79 @@
+AIActionTable_GoGoRainDance: ; 14f8f (5:4f8f)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14f9b (5:4f9b)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 14f9f (5:4f9f)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14fb0 (5:4fb0)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14fb4 (5:4fb4)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14fb8 (5:4fb8)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14fbc (5:4fbc)
+	db LAPRAS
+	db HORSEA
+	db GOLDEEN
+	db SQUIRTLE
+	db $00
+
+.list_bench ; 14fc1 (5:4fc1)
+	db SQUIRTLE
+	db HORSEA
+	db GOLDEEN
+	db LAPRAS
+	db $00
+
+.list_retreat ; 14fc6 (5:4fc6)
+	ai_retreat SQUIRTLE,  -3
+	ai_retreat WARTORTLE, -2
+	ai_retreat HORSEA,    -1
+	db $00
+
+.list_energy ; 14fcd (5:4fcd)
+	ai_energy SQUIRTLE,  2, +0
+	ai_energy WARTORTLE, 3, +0
+	ai_energy BLASTOISE, 5, +0
+	ai_energy GOLDEEN,   1, +0
+	ai_energy SEAKING,   2, +0
+	ai_energy HORSEA,    2, +0
+	ai_energy SEADRA,    3, +0
+	ai_energy LAPRAS,    3, +0
+	db $00
+
+.list_prize ; 14fe6 (5:4fe6)
+	db GAMBLER
+	db ENERGY_RETRIEVAL
+	db SUPER_ENERGY_RETRIEVAL
+	db BLASTOISE
+	db $00
+
+.store_list_pointers ; 14feb (5:4feb)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/im_ronald.asm b/src/engine/ai/decks/im_ronald.asm
new file mode 100644
index 0000000..b002d83
--- /dev/null
+++ b/src/engine/ai/decks/im_ronald.asm
@@ -0,0 +1,80 @@
+AIActionTable_ImRonald: ; 152bd (5:52bd)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 152c9 (5:52c9)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 152cd (5:52cd)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 152de (5:52de)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 152e2 (5:52e2)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 152e6 (5:52e6)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 152ea (5:52ea)
+	db LAPRAS
+	db SEEL
+	db CHARMANDER
+	db CUBONE
+	db SQUIRTLE
+	db GROWLITHE
+	db $00
+
+.list_bench ; 152f1 (5:52f1)
+	db CHARMANDER
+	db SQUIRTLE
+	db SEEL
+	db CUBONE
+	db GROWLITHE
+	db LAPRAS
+	db $00
+
+.list_retreat ; 152f8 (5:52f8)
+	db $00
+
+.list_energy ; 152f9 (5:52f9)
+	ai_energy CHARMANDER, 3, +0
+	ai_energy CHARMELEON, 5, +0
+	ai_energy GROWLITHE,  2, +0
+	ai_energy ARCANINE2,  4, +0
+	ai_energy SQUIRTLE,   2, +0
+	ai_energy WARTORTLE,  3, +0
+	ai_energy SEEL,       3, +0
+	ai_energy DEWGONG,    4, +0
+	ai_energy LAPRAS,     3, +0
+	ai_energy CUBONE,     3, +0
+	ai_energy MAROWAK1,   3, +0
+	db $00
+
+.list_prize ; 1531b (5:531b)
+	db LAPRAS
+	db $00
+
+.store_list_pointers ; 1531d (5:531d)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/invincible_ronald.asm b/src/engine/ai/decks/invincible_ronald.asm
new file mode 100644
index 0000000..463560b
--- /dev/null
+++ b/src/engine/ai/decks/invincible_ronald.asm
@@ -0,0 +1,78 @@
+AIActionTable_InvincibleRonald: ; 153e8 (5:53e8)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 153f4 (5:53f4)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 153f8 (5:53f8)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 15409 (5:5409)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 1540d (5:540d)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 15411 (5:5411)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 15415 (5:5415)
+	db KANGASKHAN
+	db MAGMAR2
+	db CHANSEY
+	db GEODUDE
+	db SCYTHER
+	db GRIMER
+	db $00
+
+.list_bench ; 1541c (5:541c)
+	db GRIMER
+	db SCYTHER
+	db GEODUDE
+	db CHANSEY
+	db MAGMAR2
+	db KANGASKHAN
+	db $00
+
+.list_retreat ; 15423 (5:5423)
+	ai_retreat GRIMER, -1
+	db $00
+
+.list_energy ; 15426 (5:5426)
+	ai_energy GRIMER,     1, -1
+	ai_energy MUK,        3, -1
+	ai_energy SCYTHER,    4, +1
+	ai_energy MAGMAR2,    2, +0
+	ai_energy GEODUDE,    2, +0
+	ai_energy GRAVELER,   3, +0
+	ai_energy CHANSEY,    4, +0
+	ai_energy KANGASKHAN, 4, -1
+	db $00
+
+.list_prize ; 1543f (5:543f)
+	db GAMBLER
+	db $00
+
+.store_list_pointers ; 15441 (5:5441)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/legendary_articuno.asm b/src/engine/ai/decks/legendary_articuno.asm
new file mode 100644
index 0000000..6409330
--- /dev/null
+++ b/src/engine/ai/decks/legendary_articuno.asm
@@ -0,0 +1,209 @@
+AIActionTable_LegendaryArticuno: ; 14c0b (5:4c0b)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14c17 (5:4c17)
+	call AIDoTurn_LegendaryArticuno
+	ret
+
+.start_duel ; 14c1b (5:4c1b)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14c2c (5:4c2c)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14c30 (5:4c30)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14c34 (5:4c34)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14c38 (5:4c38)
+	db CHANSEY
+	db LAPRAS
+	db DITTO
+	db SEEL
+	db ARTICUNO1
+	db ARTICUNO2
+	db $00
+
+.list_bench ; 14c3f (5:4c3f)
+	db ARTICUNO1
+	db SEEL
+	db LAPRAS
+	db CHANSEY
+	db DITTO
+	db $00
+
+.list_retreat ; 14c45 (5:4c45)
+	ai_retreat SEEL,  -3
+	ai_retreat DITTO, -3
+	db $00
+
+.list_energy ; 14c4a (5:4c4a)
+	ai_energy SEEL,      3, +1
+	ai_energy DEWGONG,   4, +0
+	ai_energy LAPRAS,    3, +0
+	ai_energy ARTICUNO1, 4, +1
+	ai_energy ARTICUNO2, 3, +0
+	ai_energy CHANSEY,   0, -8
+	ai_energy DITTO,     3, +0
+	db $00
+
+.list_prize ; 14c60 (5:4c60)
+	db GAMBLER
+	db ARTICUNO2
+	db $00
+
+.store_list_pointers ; 14c63 (5:4c63)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
+
+; this routine handles how Legendary Articuno
+; prioritizes playing energy cards to each Pokémon.
+; first, it makes sure that all Lapras have at least
+; 3 energy cards before moving on to Articuno,
+; and then to Dewgong and Seel
+ScoreLegendaryArticunoCards: ; 14c91 (5:4c91)
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	cp 3
+	ret c
+
+; player prizes >= 3
+; if Lapras has more than half HP and
+; can use second attack, check next for Articuno
+; otherwise, check if Articuno or Dewgong
+; have more than half HP and can use second attack
+; and if so, the next Pokémon to check is Lapras
+	ld a, LAPRAS
+	call CheckForBenchIDAtHalfHPAndCanUseSecondAttack
+	jr c, .articuno
+	ld a, ARTICUNO1
+	call CheckForBenchIDAtHalfHPAndCanUseSecondAttack
+	jr c, .lapras
+	ld a, DEWGONG
+	call CheckForBenchIDAtHalfHPAndCanUseSecondAttack
+	jr c, .lapras
+	jr .articuno
+
+; the following routines check for certain card IDs in bench
+; and call RaiseAIScoreToAllMatchingIDsInBench if these are found.
+; for Lapras, an additional check is made to its
+; attached energy count, which skips calling the routine
+; if this count is >= 3
+.lapras
+	ld a, LAPRAS
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	jr nc, .articuno
+	ld e, a
+	call CountNumberOfEnergyCardsAttached
+	cp 3
+	jr nc, .articuno
+	ld a, LAPRAS
+	call RaiseAIScoreToAllMatchingIDsInBench
+	ret
+
+.articuno
+	ld a, ARTICUNO1
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	jr nc, .dewgong
+	ld a, ARTICUNO1
+	call RaiseAIScoreToAllMatchingIDsInBench
+	ret
+
+.dewgong
+	ld a, DEWGONG
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	jr nc, .seel
+	ld a, DEWGONG
+	call RaiseAIScoreToAllMatchingIDsInBench
+	ret
+
+.seel
+	ld a, SEEL
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	ret nc
+	ld a, SEEL
+	call RaiseAIScoreToAllMatchingIDsInBench
+	ret
+
+AIDoTurn_LegendaryArticuno: ; 14cf7 (5:4cf7)
+; initialize variables
+	call InitAITurnVars
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_1
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_1
+; play Pokemon from hand again
+	call AIDecidePlayPokemonCard
+; process Trainer cards phases 13 and 15
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_15
+	call AIProcessHandTrainerCards
+; if used Professor Oak, process new hand
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PROFESSOR_OAK
+	jr z, .try_attack
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_2
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_2
+	call AIDecidePlayPokemonCard
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if turn ended
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/legendary_dragonite.asm b/src/engine/ai/decks/legendary_dragonite.asm
new file mode 100644
index 0000000..597f72c
--- /dev/null
+++ b/src/engine/ai/decks/legendary_dragonite.asm
@@ -0,0 +1,166 @@
+AIActionTable_LegendaryDragonite: ; 14d60 (05:4d60)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14d6c (5:4d6c)
+	call AIDoTurn_LegendaryDragonite
+	ret
+
+.start_duel ; 14d70 (5:4d70)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14d81 (5:4d81)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14d85 (5:4d85)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14d89 (5:4d89)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14d8d (5:4d8d)
+	db KANGASKHAN
+	db LAPRAS
+	db CHARMANDER
+	db DRATINI
+	db MAGIKARP
+	db $00
+
+.list_bench ; 14d93 (5:4d93)
+	db CHARMANDER
+	db MAGIKARP
+	db DRATINI
+	db LAPRAS
+	db KANGASKHAN
+	db $00
+
+.list_retreat ; 14d99 (5:4d99)
+	ai_retreat CHARMANDER, -1
+	ai_retreat MAGIKARP,   -5
+	db $00
+
+.list_energy ; 14d9e (5:4d9e)
+	ai_energy CHARMANDER, 3, +1
+	ai_energy CHARMELEON, 4, +1
+	ai_energy CHARIZARD,  5, +0
+	ai_energy MAGIKARP,   3, +1
+	ai_energy GYARADOS,   4, -1
+	ai_energy DRATINI,    2, +0
+	ai_energy DRAGONAIR,  4, +0
+	ai_energy DRAGONITE1, 3, -1
+	ai_energy KANGASKHAN, 2, -2
+	ai_energy LAPRAS,     3, +0
+	db $00
+
+.list_prize ; 14dbd (5:4dbd)
+	db GAMBLER
+	db DRAGONITE1
+	db KANGASKHAN
+	db $00
+
+.store_list_pointers ; 14dc1 (5:4dc1)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
+
+AIDoTurn_LegendaryDragonite: ; 14def (5:4def)
+; initialize variables
+	call InitAITurnVars
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_1
+
+; if Arena card is Kangaskhan and doesn't
+; have Energy cards attached, try attaching from hand.
+; otherwise run normal AI energy attach routine.
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, KANGASKHAN
+	cp e
+	jr nz, .attach_normally
+	call CreateEnergyCardListFromHand
+	jr c, .skip_energy_attach_1
+	ld e, PLAY_AREA_ARENA
+	call CountNumberOfEnergyCardsAttached
+	or a
+	jr nz, .attach_normally
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call AITryToPlayEnergyCard
+	jr c, .skip_energy_attach_1
+.attach_normally
+	call AIProcessAndTryToPlayEnergy
+
+.skip_energy_attach_1
+; play Pokemon from hand again
+	call AIDecidePlayPokemonCard
+	ld a, AI_TRAINER_CARD_PHASE_15
+	call AIProcessHandTrainerCards
+; if used Professor Oak, process new hand
+; if not, then proceed to attack.
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PROFESSOR_OAK
+	jr z, .try_attack
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach_2
+	call AIProcessAndTryToPlayEnergy
+.skip_energy_attach_2
+	call AIDecidePlayPokemonCard
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if turn ended
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/legendary_moltres.asm b/src/engine/ai/decks/legendary_moltres.asm
new file mode 100644
index 0000000..d07afb9
--- /dev/null
+++ b/src/engine/ai/decks/legendary_moltres.asm
@@ -0,0 +1,176 @@
+AIActionTable_LegendaryMoltres: ; 149e8 (05:49e8)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 149f4 (5:49f4)
+	call AIDoTurn_LegendaryMoltres
+	ret
+
+.start_duel ; 149f8 (5:49f8)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc ; Play Area set up was successful
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14a09 (5:4a09)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14a0d (5:4a0d)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14a11 (5:4a11)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14a15 (5:4a15)
+	db MAGMAR2
+	db GROWLITHE
+	db VULPIX
+	db MAGMAR1
+	db MOLTRES1
+	db MOLTRES2
+	db $00
+
+.list_bench ; 14a1c (5:4a1c)
+	db MOLTRES1
+	db VULPIX
+	db GROWLITHE
+	db MAGMAR2
+	db MAGMAR1
+	db $00
+
+.list_play_hand ; 14a22 (5:4a22)
+	db MOLTRES2
+	db MOLTRES1
+	db VULPIX
+	db GROWLITHE
+	db MAGMAR2
+	db MAGMAR1
+	db $00
+
+.list_retreat ; 14a29 (5:4a29)
+	ai_retreat GROWLITHE, -5
+	ai_retreat VULPIX,    -5
+	db $00
+
+.list_energy ; 14a2e (5:4a2e)
+	ai_energy VULPIX,     3, +0
+	ai_energy NINETAILS2, 3, +1
+	ai_energy GROWLITHE,  3, +1
+	ai_energy ARCANINE2,  4, +1
+	ai_energy MAGMAR1,    4, -1
+	ai_energy MAGMAR2,    1, -1
+	ai_energy MOLTRES2,   3, +2
+	ai_energy MOLTRES1,   4, +2
+	db $00
+
+.list_prize ; 14a47 (5:4a47)
+	db ENERGY_REMOVAL
+	db MOLTRES2
+	db $00
+
+.store_list_pointers ; 14a4a (5:4a4a)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_play_hand
+	store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
+
+AIDoTurn_LegendaryMoltres: ; 14a81 (5:4a81)
+; initialize variables
+	call InitAITurnVars
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; process Trainer cards
+; phase 2 through 4.
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+
+; check if AI can play Moltres2
+; from hand and if so, play it.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .skip_moltres ; skip if bench is full
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 9
+	jr nc, .skip_moltres ; skip if cards in deck <= 9
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .skip_moltres ; skip if Muk in play
+	ld a, MOLTRES2
+	call LookForCardIDInHandList_Bank5
+	jr nc, .skip_moltres ; skip if no Moltres2 in hand
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+
+.skip_moltres
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_11
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_attach_energy
+
+; if Magmar2 is the Arena card and has no energy attached,
+; try attaching an energy card to it from the hand.
+; otherwise, run normal AI energy attach routine.
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, MAGMAR2
+	cp e
+	jr nz, .attach_normally
+	; Magmar2 is the Arena card
+	call CreateEnergyCardListFromHand
+	jr c, .skip_attach_energy
+	ld e, PLAY_AREA_ARENA
+	call CountNumberOfEnergyCardsAttached
+	or a
+	jr nz, .attach_normally
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call AITryToPlayEnergyCard
+	jr c, .skip_attach_energy
+
+.attach_normally
+; play Energy card if possible
+	call AIProcessAndTryToPlayEnergy
+.skip_attach_energy
+; try playing Pokemon cards from hand again
+	call AIDecidePlayPokemonCard
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/legendary_ronald.asm b/src/engine/ai/decks/legendary_ronald.asm
new file mode 100644
index 0000000..3356838
--- /dev/null
+++ b/src/engine/ai/decks/legendary_ronald.asm
@@ -0,0 +1,203 @@
+AIActionTable_LegendaryRonald: ; 1546f (5:546f)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 1547b (5:547b)
+	call AIDoTurn_LegendaryRonald
+	ret
+
+.start_duel ; 1547f (5:547f)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 15490 (5:5490)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 15494 (5:5494)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 15498 (5:5498)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 1549c (5:549c)
+	db KANGASKHAN
+	db DRATINI
+	db EEVEE
+	db ZAPDOS3
+	db ARTICUNO2
+	db MOLTRES2
+	db $00
+
+.list_bench ; 154a3 (5:54a3)
+	db KANGASKHAN
+	db DRATINI
+	db EEVEE
+	db $00
+
+.list_play_hand ; 154a7 (5:54a7)
+	db MOLTRES2
+	db ZAPDOS3
+	db KANGASKHAN
+	db DRATINI
+	db EEVEE
+	db ARTICUNO2
+	db $00
+
+.list_retreat ; 154ae (5:54ae)
+	ai_retreat EEVEE, -2
+	db $00
+
+.list_energy ; 154b1 (5:54b1)
+	ai_energy FLAREON1,   3, +0
+	ai_energy MOLTRES2,   3, +0
+	ai_energy VAPOREON1,  3, +0
+	ai_energy ARTICUNO2,  0, -8
+	ai_energy JOLTEON1,   4, +0
+	ai_energy ZAPDOS3,    0, -8
+	ai_energy KANGASKHAN, 4, -1
+	ai_energy EEVEE,      3, +0
+	ai_energy DRATINI,    3, +0
+	ai_energy DRAGONAIR,  4, +0
+	ai_energy DRAGONITE1, 3, +0
+	db $00
+
+.list_prize ; 154d3 (5:54d3)
+	db MOLTRES2
+	db ARTICUNO2
+	db ZAPDOS3
+	db DRAGONITE1
+	db GAMBLER
+	db $00
+
+.store_list_pointers ; 154d9 (5:54d9)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_play_hand
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
+
+AIDoTurn_LegendaryRonald: ; 15507 (5:5507)
+; initialize variables
+	call InitAITurnVars
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+
+; check if AI can play Moltres2
+; from hand and if so, play it.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .skip_moltres_1 ; skip if bench is full
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 9
+	jr nc, .skip_moltres_1 ; skip if cards in deck <= 9
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .skip_moltres_1 ; skip if Muk in play
+	ld a, MOLTRES2
+	call LookForCardIDInHandList_Bank5
+	jr nc, .skip_moltres_1 ; skip if no Moltres2 in hand
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+
+.skip_moltres_1
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+; play Energy card if possible
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_attach_energy_1
+	call AIProcessAndTryToPlayEnergy
+.skip_attach_energy_1
+; try playing Pokemon cards from hand again
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_15
+; if used Professor Oak, process new hand
+; if not, then proceed to attack.
+	call AIProcessHandTrainerCards
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_PROFESSOR_OAK
+	jr z, .try_attack
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_02
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+
+; check if AI can play Moltres2
+; from hand and if so, play it.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .skip_moltres_2 ; skip if bench is full
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 9
+	jr nc, .skip_moltres_2 ; skip if cards in deck <= 9
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .skip_moltres_2 ; skip if Muk in play
+	ld a, MOLTRES2
+	call LookForCardIDInHandList_Bank5
+	jr nc, .skip_moltres_2 ; skip if no Moltres2 in hand
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+
+.skip_moltres_2
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_05
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_attach_energy_2
+	call AIProcessAndTryToPlayEnergy
+.skip_attach_energy_2
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if turn ended
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/legendary_zapdos.asm b/src/engine/ai/decks/legendary_zapdos.asm
new file mode 100644
index 0000000..cc99f0c
--- /dev/null
+++ b/src/engine/ai/decks/legendary_zapdos.asm
@@ -0,0 +1,153 @@
+AIActionTable_LegendaryZapdos: ; 14b0f (05:4b0f)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14b1b (5:4b1b)
+	call AIDoTurn_LegendaryZapdos
+	ret
+
+.start_duel ; 14b1f (5:4b1f)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14b30 (5:4b30)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14b34 (5:4b34)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14b38 (5:4b38)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14b3c (5:4b3c)
+	db ELECTABUZZ2
+	db VOLTORB
+	db EEVEE
+	db ZAPDOS1
+	db ZAPDOS2
+	db ZAPDOS3
+	db $00
+
+.list_bench ; 14b43 (5:4b43)
+	db ZAPDOS2
+	db ZAPDOS1
+	db EEVEE
+	db VOLTORB
+	db ELECTABUZZ2
+	db $00
+
+.list_retreat ; 14b49 (5:4b49)
+	ai_retreat EEVEE,       -5
+	ai_retreat VOLTORB,     -5
+	ai_retreat ELECTABUZZ2, -5
+	db $00
+
+.list_energy ; 14b50 (5:4b50)
+	ai_energy VOLTORB,     1, -1
+	ai_energy ELECTRODE1,  3, +0
+	ai_energy ELECTABUZZ2, 2, -1
+	ai_energy JOLTEON2,    3, +1
+	ai_energy ZAPDOS1,     4, +2
+	ai_energy ZAPDOS2,     4, +2
+	ai_energy ZAPDOS3,     3, +1
+	ai_energy EEVEE,       3, +0
+	db $00
+
+.list_prize ; 14b69 (5:4b69)
+	db GAMBLER
+	db ZAPDOS3
+	db $00
+
+.store_list_pointers ; 14b6c (5:4b6c)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
+
+AIDoTurn_LegendaryZapdos: ; 14b9a (5:4b9a)
+; initialize variables
+	call InitAITurnVars
+	farcall HandleAIAntiMewtwoDeckStrategy
+	jp nc, .try_attack
+; process Trainer cards
+	ld a, AI_TRAINER_CARD_PHASE_01
+	call AIProcessHandTrainerCards
+	ld a, AI_TRAINER_CARD_PHASE_04
+	call AIProcessHandTrainerCards
+; play Pokemon from hand
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_07
+	call AIProcessHandTrainerCards
+	call AIProcessRetreat
+	ld a, AI_TRAINER_CARD_PHASE_10
+	call AIProcessHandTrainerCards
+; play Energy card if possible.
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .skip_energy_attach
+
+; if Arena card is Voltorb and there's Electrode1 in hand,
+; or if it's Electabuzz, try attaching Energy card
+; to the Arena card if it doesn't have any energy attached.
+; Otherwise if Energy card is not needed,
+; go through normal AI energy attach routine.
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, VOLTORB
+	cp e
+	jr nz, .check_electabuzz
+	ld a, ELECTRODE1
+	call LookForCardIDInHandList_Bank5
+	jr nc, .attach_normally
+	jr .voltorb_or_electabuzz
+.check_electabuzz
+	ld a, ELECTABUZZ2
+	cp e
+	jr nz, .attach_normally
+
+.voltorb_or_electabuzz
+	call CreateEnergyCardListFromHand
+	jr c, .skip_energy_attach
+	ld e, PLAY_AREA_ARENA
+	call CountNumberOfEnergyCardsAttached
+	or a
+	jr nz, .attach_normally
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call AITryToPlayEnergyCard
+	jr c, .skip_energy_attach
+
+.attach_normally
+	call AIProcessAndTryToPlayEnergy
+
+.skip_energy_attach
+; play Pokemon from hand again
+	call AIDecidePlayPokemonCard
+	ret c ; return if turn ended
+	ld a, AI_TRAINER_CARD_PHASE_13
+	call AIProcessHandTrainerCards
+.try_attack
+; attack if possible, if not,
+; finish turn without attacking.
+	call AIProcessAndTryToUseAttack
+	ret c ; return if turn ended
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
diff --git a/src/engine/ai/decks/powerful_ronald.asm b/src/engine/ai/decks/powerful_ronald.asm
new file mode 100644
index 0000000..096fbea
--- /dev/null
+++ b/src/engine/ai/decks/powerful_ronald.asm
@@ -0,0 +1,92 @@
+AIActionTable_PowerfulRonald: ; 1534b (5:534b)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 15357 (5:5357)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 1535b (5:535b)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 1536c (5:536c)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 15370 (5:5370)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 15374 (5:5374)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 15378 (5:5378)
+	db KANGASKHAN
+	db ELECTABUZZ2
+	db HITMONCHAN
+	db MR_MIME
+	db LICKITUNG
+	db HITMONLEE
+	db TAUROS
+	db JYNX
+	db MEWTWO1
+	db DODUO
+	db $00
+
+.list_bench ; 15383 (5:5383)
+	db KANGASKHAN
+	db HITMONLEE
+	db HITMONCHAN
+	db TAUROS
+	db DODUO
+	db JYNX
+	db MEWTWO1
+	db ELECTABUZZ2
+	db MR_MIME
+	db LICKITUNG
+	db $00
+
+.list_retreat ; 1538e (5:538e)
+	ai_retreat KANGASKHAN, -1
+	ai_retreat DODUO,      -1
+	ai_retreat DODRIO,     -1
+	db $00
+
+.list_energy ; 15395 (5:5395)
+	ai_energy ELECTABUZZ2, 2, +1
+	ai_energy HITMONLEE,   3, +1
+	ai_energy HITMONCHAN,  3, +1
+	ai_energy MR_MIME,     2, +0
+	ai_energy JYNX,        3, +0
+	ai_energy MEWTWO1,     2, +0
+	ai_energy DODUO,       3, -1
+	ai_energy DODRIO,      3, -1
+	ai_energy LICKITUNG,   2, +0
+	ai_energy KANGASKHAN,  4, -1
+	ai_energy TAUROS,      3, +0
+	db $00
+
+.list_prize ; 153b7 (5:53b7)
+	db GAMBLER
+	db ENERGY_REMOVAL
+	db $00
+
+.store_list_pointers ; 153ba (5:53ba)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/rock_crusher.asm b/src/engine/ai/decks/rock_crusher.asm
new file mode 100644
index 0000000..41a50fa
--- /dev/null
+++ b/src/engine/ai/decks/rock_crusher.asm
@@ -0,0 +1,74 @@
+AIActionTable_RockCrusher: ; 14f0e (5:4f0e)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 14f1a (5:4f1a)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 14f1e (5:4f1e)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 14f2f (5:4f2f)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 14f33 (5:4f33)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 14f37 (5:4f37)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 14f3b (5:4f3b)
+	db RHYHORN
+	db ONIX
+	db GEODUDE
+	db DIGLETT
+	db $00
+
+.list_bench ; 14f40 (5:4f40)
+	db DIGLETT
+	db GEODUDE
+	db RHYHORN
+	db ONIX
+	db $00
+
+.list_retreat ; 14f45 (5:4f45)
+	ai_retreat DIGLETT, -1
+	db $00
+
+.list_energy ; 14f48 (5:4f48)
+	ai_energy DIGLETT,  3, +1
+	ai_energy DUGTRIO,  4, +0
+	ai_energy GEODUDE,  2, +1
+	ai_energy GRAVELER, 3, +0
+	ai_energy GOLEM,    4, +0
+	ai_energy ONIX,     2, -1
+	ai_energy RHYHORN,  3, +0
+	db $00
+
+.list_prize ; 14f5e (5:4f5e)
+	db ENERGY_REMOVAL
+	db RHYHORN
+	db $00
+
+.store_list_pointers ; 14f61 (5:4f61)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/sams_practice.asm b/src/engine/ai/decks/sams_practice.asm
new file mode 100644
index 0000000..dddce61
--- /dev/null
+++ b/src/engine/ai/decks/sams_practice.asm
@@ -0,0 +1,205 @@
+; AI for Sam's practice duel, which handles his scripted actions.
+; will act as a normal duelist AI after turn 7.
+AIActionTable_SamPractice: ; 147bd (05:47bd)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 147c9 (5:47c9)
+	call IsAIPracticeScriptedTurn
+	jr nc, .scripted_1
+; not scripted, use AI main turn logic
+	call AIMainTurnLogic
+	ret
+.scripted_1 ; use scripted actions instead
+	call AIPerformScriptedTurn
+	ret
+
+.start_duel ; 147d6 (5:47d6)
+	call SetSamsStartingPlayArea
+	ret
+
+.forced_switch ; 147da (5:47da)
+	call IsAIPracticeScriptedTurn
+	jr nc, .scripted_2
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+.scripted_2
+	call PickRandomBenchPokemon
+	ret
+
+.ko_switch: ; 147e7 (5:47e7)
+	call IsAIPracticeScriptedTurn
+	jr nc, .scripted_3
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+.scripted_3
+	call GetPlayAreaLocationOfRaticateOrRattata
+	ret
+
+.take_prize: ; 147f4 (5:47f4)
+	call AIPickPrizeCards
+	ret
+
+; returns carry if number of turns
+; the AI has taken >= 7.
+; used to know whether AI Sam is still
+; doing scripted turns.
+IsAIPracticeScriptedTurn: ; 147f8 (5:47f8)
+	ld a, [wDuelTurns]
+	srl a
+	cp 7
+	ccf
+	ret
+
+; places one Machop from the hand to the Play Area
+; and sets the number of prizes to 2.
+SetSamsStartingPlayArea: ; 14801 (5:4801)
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.loop_hand
+	ld a, [hli]
+	ldh [hTempCardIndex_ff98], a
+	cp $ff
+	ret z
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp MACHOP
+	jr nz, .loop_hand
+	ldh a, [hTempCardIndex_ff98]
+	call PutHandPokemonCardInPlayArea
+	ld a, 2
+	ld [wDuelInitialPrizes], a
+	ret
+
+; outputs in a Play Area location of Raticate or Rattata
+; in the Bench. If neither is found, just output PLAY_AREA_BENCH_1.
+GetPlayAreaLocationOfRaticateOrRattata: ; 1481f (5:481f)
+	ld a, RATICATE
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	cp $ff
+	jr nz, .found
+	ld a, RATTATA
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank5
+	cp $ff
+	jr nz, .found
+	ld a, PLAY_AREA_BENCH_1
+.found
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ret
+
+; has AI execute some scripted actions depending on Duel turn.
+AIPerformScriptedTurn: ; 1483a (5:483a)
+	ld a, [wDuelTurns]
+	srl a
+	ld hl, .scripted_actions_list
+	call JumpToFunctionInTable
+
+; always attack with Arena card's first attack.
+; if it's unusable end turn without attacking.
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .unusable
+	call AITryUseAttack
+	ret
+
+.unusable
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
+
+.scripted_actions_list ; 1485a (05:485a)
+	dw .turn_1
+	dw .turn_2
+	dw .turn_3
+	dw .turn_4
+	dw .turn_5
+	dw .turn_6
+	dw .turn_7
+
+.turn_1 ; 14868 (5:4868)
+	ld d, MACHOP
+	ld e, FIGHTING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
+
+.turn_2 ; 14870 (5:4870)
+	ld a, RATTATA
+	call LookForCardIDInHandList_Bank5
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+	ld d, RATTATA
+	ld e, FIGHTING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
+
+.turn_3 ; 14884 (5:4884)
+	ld a, RATTATA
+	ld b, PLAY_AREA_ARENA
+	call LookForCardIDInPlayArea_Bank5
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, RATICATE
+	call LookForCardIDInHandList_Bank5
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EVOLVE_PKMN
+	bank1call AIMakeDecision
+	ld d, RATICATE
+	ld e, LIGHTNING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
+
+.turn_4 ; 148a1 (5:48a1)
+	ld d, RATICATE
+	ld e, LIGHTNING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
+
+.turn_5 ; 148a9 (5:48a9)
+	ld a, MACHOP
+	call LookForCardIDInHandList_Bank5
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+	ld d, MACHOP
+	ld e, FIGHTING_ENERGY
+	call AIAttachEnergyInHandToCardInBench
+
+; this is a bug, it's attempting to compare a card ID with a deck index.
+; the intention was to change the card to switch to depending on whether
+; the first Machop was KO'd at this point in the Duel or not.
+; because of the buggy comparison, this will always jump the
+; 'inc a' instruction and switch to PLAY_AREA_BENCH_1.
+; in a normal Practice Duel following Dr. Mason's instructions,
+; this will always lead to the AI correctly switching Raticate with Machop,
+; but in case of a "Free" Duel where the first Machop is not KO'd,
+; the intention was to switch to PLAY_AREA_BENCH_2 instead.
+; but due to 'inc a' always being skipped, it will switch to Raticate.
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	cp MACHOP ; wrong
+	ld a, PLAY_AREA_BENCH_1
+	jr nz, .retreat
+	inc a ; PLAY_AREA_BENCH_2
+
+.retreat
+	call AITryToRetreat
+	ret
+
+.turn_6 ; 148cc (5:48cc)
+	ld d, MACHOP
+	ld e, FIGHTING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
+
+.turn_7 ; 148d4 (5:48d4)
+	ld d, MACHOP
+	ld e, FIGHTING_ENERGY
+	call AIAttachEnergyInHandToCardInPlayArea
+	ret
diff --git a/src/engine/ai/decks/strange_psyshock.asm b/src/engine/ai/decks/strange_psyshock.asm
new file mode 100644
index 0000000..ef378b0
--- /dev/null
+++ b/src/engine/ai/decks/strange_psyshock.asm
@@ -0,0 +1,81 @@
+AIActionTable_StrangePsyshock: ; 15122 (5:5122)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 1512e (5:512e)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 15132 (5:5132)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 15143 (5:5143)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 15147 (5:5147)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 1514b (5:514b)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 1514f (5:514f)
+	db KANGASKHAN
+	db CHANSEY
+	db SNORLAX
+	db MR_MIME
+	db ABRA
+	db $00
+
+.list_bench ; 15155 (5:5155)
+	db ABRA
+	db MR_MIME
+	db KANGASKHAN
+	db SNORLAX
+	db CHANSEY
+	db $00
+
+.list_retreat ; 1515b (5:515b)
+	ai_retreat ABRA,       -3
+	ai_retreat SNORLAX,    -3
+	ai_retreat KANGASKHAN, -1
+	ai_retreat CHANSEY,    -1
+	db $00
+
+.list_energy ; 15164 (5:5164)
+	ai_energy ABRA,       3, +1
+	ai_energy KADABRA,    3, +0
+	ai_energy ALAKAZAM,   3, +0
+	ai_energy MR_MIME,    2, +0
+	ai_energy CHANSEY,    2, -2
+	ai_energy KANGASKHAN, 4, -2
+	ai_energy SNORLAX,    0, -8
+	db $00
+
+.list_prize ; 1517a (5:517a)
+	db GAMBLER
+	db MR_MIME
+	db ALAKAZAM
+	db SWITCH
+	db $00
+
+.store_list_pointers ; 1517f (5:517f)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/unreferenced.asm b/src/engine/ai/decks/unreferenced.asm
new file mode 100644
index 0000000..3cd56c3
--- /dev/null
+++ b/src/engine/ai/decks/unreferenced.asm
@@ -0,0 +1,42 @@
+AIActionTable_Unreferenced: ; 1406a (5:406a)
+	dw $406c
+	dw .do_turn
+	dw .do_turn
+	dw .star_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn
+	call AIDecidePlayPokemonCard
+	call AIDecideWhetherToRetreat
+	jr nc, .try_attack
+	call AIDecideBenchPokemonToSwitchTo
+	call AITryToRetreat
+	call AIDecideWhetherToRetreat
+	jr nc, .try_attack
+	call AIDecideBenchPokemonToSwitchTo
+	call AITryToRetreat
+.try_attack
+	call AIProcessAndTryToPlayEnergy
+	call AIProcessAndTryToUseAttack
+	ret c
+	ld a, OPPACTION_FINISH_NO_ATTACK
+	bank1call AIMakeDecision
+	ret
+
+.star_duel
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize
+	call AIPickPrizeCards
+	ret
diff --git a/src/engine/ai/decks/wonders_of_science.asm b/src/engine/ai/decks/wonders_of_science.asm
new file mode 100644
index 0000000..706a7e6
--- /dev/null
+++ b/src/engine/ai/decks/wonders_of_science.asm
@@ -0,0 +1,77 @@
+AIActionTable_WondersOfScience: ; 151ad (5:51ad)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 151b9 (5:51b9)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 151bd (5:51bd)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 151ce (5:51ce)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 151d2 (5:51d2)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 151d6 (5:51d6)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 151da (5:51da)
+	db MEWTWO1
+	db MEWTWO3
+	db MEWTWO2
+	db GRIMER
+	db KOFFING
+	db PORYGON
+	db $00
+
+.list_bench ; 151e1 (5:51e1)
+	db GRIMER
+	db KOFFING
+	db MEWTWO3
+	db MEWTWO2
+	db MEWTWO1
+	db PORYGON
+	db $00
+
+.list_retreat ; 151e8 (5:51e8)
+	db $00
+
+.list_energy ; 151e9 (5:51e9)
+	ai_energy GRIMER,  3, +0
+	ai_energy MUK,     4, +0
+	ai_energy KOFFING, 2, +0
+	ai_energy WEEZING, 3, +0
+	ai_energy MEWTWO1, 2, -1
+	ai_energy MEWTWO3, 2, -1
+	ai_energy MEWTWO2, 2, -1
+	ai_energy PORYGON, 2, -1
+	db $00
+
+.list_prize ; 15202 (5:5202)
+	db MUK
+	db $00
+
+.store_list_pointers ; 15204 (5:5204)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/decks/zapping_selfdestruct.asm b/src/engine/ai/decks/zapping_selfdestruct.asm
new file mode 100644
index 0000000..da5e7c6
--- /dev/null
+++ b/src/engine/ai/decks/zapping_selfdestruct.asm
@@ -0,0 +1,75 @@
+AIActionTable_ZappingSelfdestruct: ; 15019 (5:5019)
+	dw .do_turn ; unused
+	dw .do_turn
+	dw .start_duel
+	dw .forced_switch
+	dw .ko_switch
+	dw .take_prize
+
+.do_turn ; 15025 (5:5025)
+	call AIMainTurnLogic
+	ret
+
+.start_duel ; 15029 (5:5029)
+	call InitAIDuelVars
+	call .store_list_pointers
+	call SetUpBossStartingHandAndDeck
+	call TrySetUpBossStartingPlayArea
+	ret nc
+	call AIPlayInitialBasicCards
+	ret
+
+.forced_switch ; 1503a (5:503a)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.ko_switch ; 1503e (5:503e)
+	call AIDecideBenchPokemonToSwitchTo
+	ret
+
+.take_prize ; 15042 (5:5042)
+	call AIPickPrizeCards
+	ret
+
+.list_arena ; 15046 (5:5046)
+	db KANGASKHAN
+	db ELECTABUZZ2
+	db TAUROS
+	db MAGNEMITE1
+	db VOLTORB
+	db $00
+
+.list_bench ; 1504c (5:504c)
+	db MAGNEMITE1
+	db VOLTORB
+	db ELECTABUZZ2
+	db TAUROS
+	db KANGASKHAN
+	db $00
+
+.list_retreat ; 15052 (5:5052)
+	ai_retreat VOLTORB, -1
+	db $00
+
+.list_energy ; 15055 (5:5055)
+	ai_energy MAGNEMITE1,  3, +1
+	ai_energy MAGNETON1,   4, +0
+	ai_energy VOLTORB,     3, +1
+	ai_energy ELECTRODE1,  3, +0
+	ai_energy ELECTABUZZ2, 1, +0
+	ai_energy KANGASKHAN,  2, -2
+	ai_energy TAUROS,      3, +0
+	db $00
+
+.list_prize ; 1506b (5:506b)
+	db KANGASKHAN
+	db $00
+
+.store_list_pointers ; 1506d (5:506d)
+	store_list_pointer wAICardListAvoidPrize, .list_prize
+	store_list_pointer wAICardListArenaPriority, .list_arena
+	store_list_pointer wAICardListBenchPriority, .list_bench
+	store_list_pointer wAICardListPlayFromHandPriority, .list_bench
+	; missing store_list_pointer wAICardListRetreatBonus, .list_retreat
+	store_list_pointer wAICardListEnergyBonus, .list_energy
+	ret
diff --git a/src/engine/ai/energy.asm b/src/engine/ai/energy.asm
new file mode 100644
index 0000000..af1aa32
--- /dev/null
+++ b/src/engine/ai/energy.asm
@@ -0,0 +1,1048 @@
+; processes AI energy card playing logic
+; with AI_ENERGY_FLAG_DONT_PLAY flag on
+; unreferenced
+Func_16488: ; 16488 (5:6488)
+	ld a, AI_ENERGY_FLAG_DONT_PLAY
+	ld [wAIEnergyAttachLogicFlags], a
+	ld de, wTempPlayAreaAIScore
+	ld hl, wPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+	ld a, [wAIScore]
+	ld [de], a
+	jr AIProcessAndTryToPlayEnergy.has_logic_flags
+
+; have AI choose an energy card to play, but do not play it.
+; does not consider whether the cards have evolutions to be played.
+; return carry if an energy card is chosen to use in any Play Area card,
+; and if so, return its Play Area location in hTempPlayAreaLocation_ff9d.
+AIProcessButDontPlayEnergy_SkipEvolution: ; 164a1 (5:64a1)
+	ld a, AI_ENERGY_FLAG_DONT_PLAY | AI_ENERGY_FLAG_SKIP_EVOLUTION
+	ld [wAIEnergyAttachLogicFlags], a
+
+; backup wPlayAreaAIScore in wTempPlayAreaAIScore.
+	ld de, wTempPlayAreaAIScore
+	ld hl, wPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+
+	ld a, [wAIScore]
+	ld [de], a
+
+	jr AIProcessEnergyCards
+
+; have AI choose an energy card to play, but do not play it.
+; does not consider whether the cards have evolutions to be played.
+; return carry if an energy card is chosen to use in any Bench card,
+; and if so, return its Play Area location in hTempPlayAreaLocation_ff9d.
+AIProcessButDontPlayEnergy_SkipEvolutionAndArena: ; 164ba (5:64ba)
+	ld a, AI_ENERGY_FLAG_DONT_PLAY | AI_ENERGY_FLAG_SKIP_EVOLUTION | AI_ENERGY_FLAG_SKIP_ARENA_CARD
+	ld [wAIEnergyAttachLogicFlags], a
+
+; backup wPlayAreaAIScore in wTempPlayAreaAIScore.
+	ld de, wTempPlayAreaAIScore
+	ld hl, wPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+
+	ld a, [wAIScore]
+	ld [de], a
+
+	jr AIProcessEnergyCards
+
+; copies wTempPlayAreaAIScore to wPlayAreaAIScore
+; and loads wAIScore with value in wTempAIScore.
+; identical to RetrievePlayAreaAIScoreFromBackup2.
+RetrievePlayAreaAIScoreFromBackup1: ; 164d3 (5:64d3)
+	push af
+	ld de, wPlayAreaAIScore
+	ld hl, wTempPlayAreaAIScore
+	ld b, MAX_PLAY_AREA_POKEMON
+.loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .loop
+	ld a, [hl]
+	ld [wAIScore], a
+	pop af
+	ret
+
+; have AI decide whether to play energy card from hand
+; and determine which card is best to attach it.
+AIProcessAndTryToPlayEnergy: ; 164e8 (5:64e8)
+	xor a
+	ld [wAIEnergyAttachLogicFlags], a
+
+.has_logic_flags
+	call CreateEnergyCardListFromHand
+	jr nc, AIProcessEnergyCards
+
+; no energy
+	ld a, [wAIEnergyAttachLogicFlags]
+	or a
+	jr z, .exit
+	jp RetrievePlayAreaAIScoreFromBackup1
+.exit
+	or a
+	ret
+
+; have AI decide whether to play energy card
+; and determine which card is best to attach it.
+AIProcessEnergyCards: ; 164fc (5:64fc)
+; initialize Play Area AI score
+	ld a, $80
+	ld b, MAX_PLAY_AREA_POKEMON
+	ld hl, wPlayAreaEnergyAIScore
+.loop
+	ld [hli], a
+	dec b
+	jr nz, .loop
+
+; Legendary Articuno Deck has its own energy card logic
+	call HandleLegendaryArticunoEnergyScoring
+
+; start the main Play Area loop
+	ld b, PLAY_AREA_ARENA
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+
+.loop_play_area
+	push bc
+	ld a, b
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, $80
+	ld [wAIScore], a
+	ld a, $ff
+	ld [wTempAI], a
+	ld a, [wAIEnergyAttachLogicFlags]
+	and AI_ENERGY_FLAG_SKIP_EVOLUTION
+	jr nz, .check_venusaur
+
+; check if energy needed is found in hand
+; and if there's an evolution in hand or deck
+; and if so, add to AI score
+	call CreateHandCardList
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld [wCurCardCanAttack], a
+	call GetAttacksEnergyCostBits
+	ld hl, wDuelTempList
+	call CheckEnergyFlagsNeededInList
+	jp nc, .store_score
+	ld a, [wCurCardCanAttack]
+	call CheckForEvolutionInList
+	jr nc, .no_evolution_in_hand
+	ld [wTempAI], a ; store evolution card found
+	ld a, 2
+	call AddToAIScore
+	jr .check_venusaur
+
+.no_evolution_in_hand
+	ld a, [wCurCardCanAttack]
+	call CheckForEvolutionInDeck
+	jr nc, .check_venusaur
+	ld a, 1
+	call AddToAIScore
+
+; if there's no Muk in any Play Area
+; and there's Venusaur2 in own Play Area,
+; add to AI score
+.check_venusaur
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .check_if_active
+	ld a, VENUSAUR2
+	call CountPokemonIDInPlayArea
+	jr nc, .check_if_active
+	ld a, 1
+	call AddToAIScore
+
+.check_if_active
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .bench
+
+; arena
+	ld a, [wAIBarrierFlagCounter]
+	bit AI_MEWTWO_MILL_F, a
+	jr z, .add_to_score
+
+; subtract from score instead
+; if Player is running Mewtwo1 mill deck.
+	ld a, 5
+	call SubFromAIScore
+	jr .check_defending_can_ko
+
+.add_to_score
+	ld a, 4
+	call AddToAIScore
+
+; lower AI score if poison/double poison
+; will KO Pokémon between turns
+; or if the defending Pokémon can KO
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	call CalculateByteTensDigit
+	cp 3
+	jr nc, .check_defending_can_ko
+	; hp < 30
+	cp 2
+	jr z, .has_20_hp
+	; hp = 10
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and POISONED
+	jr z, .check_defending_can_ko
+	jr .poison_will_ko
+.has_20_hp
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and DOUBLE_POISONED
+	jr z, .check_defending_can_ko
+.poison_will_ko
+	ld a, 10
+	call SubFromAIScore
+	jr .check_bench
+.check_defending_can_ko
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .ai_score_bonus
+	ld a, 10
+	call SubFromAIScore
+
+; if either poison will KO or defending Pokémon can KO,
+; check if there are bench Pokémon,
+; if there are not, add AI score
+.check_bench
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	jr nz, .ai_score_bonus
+	ld a, 6
+	call AddToAIScore
+	jr .ai_score_bonus
+
+; lower AI score by 3 - (bench HP)/10
+; if bench HP < 30
+.bench
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	call CalculateByteTensDigit
+	cp 3
+	jr nc, .ai_score_bonus
+; hp < 30
+	ld b, a
+	ld a, 3
+	sub b
+	call SubFromAIScore
+
+; check list in wAICardListEnergyBonus
+.ai_score_bonus
+	ld a, [wAICardListEnergyBonus + 1]
+	or a
+	jr z, .check_boss_deck ; is null
+	ld h, a
+	ld a, [wAICardListEnergyBonus]
+	ld l, a
+
+	push hl
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	pop hl
+
+.loop_id_list
+	ld a, [hli]
+	or a
+	jr z, .check_boss_deck
+	cp e
+	jr nz, .next_id
+
+	; number of attached energy cards
+	ld a, [hli]
+	ld d, a
+	push de
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	pop de
+	cp d
+	jr c, .check_id_score
+	; already reached target number of energy cards
+	ld a, 10
+	call SubFromAIScore
+	jr .store_score
+
+.check_id_score
+	ld a, [hli]
+	cp $80
+	jr c, .decrease_score_1
+	sub $80
+	call AddToAIScore
+	jr .check_boss_deck
+
+.decrease_score_1
+	ld d, a
+	ld a, $80
+	sub d
+	call SubFromAIScore
+	jr .check_boss_deck
+
+.next_id
+	inc hl
+	inc hl
+	jr .loop_id_list
+
+; if it's a boss deck, call Func_174f2
+; and apply to the AI score the values
+; determined for this card
+.check_boss_deck
+	call CheckIfNotABossDeckID
+	jr c, .skip_boss_deck
+
+	call Func_174f2
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld c, a
+	ld b, $00
+	ld hl, wPlayAreaEnergyAIScore
+	add hl, bc
+	ld a, [hl]
+	cp $80
+	jr c, .decrease_score_2
+	sub $80
+	call AddToAIScore
+	jr .skip_boss_deck
+
+.decrease_score_2
+	ld b, a
+	ld a, $80
+	sub b
+	call SubFromAIScore
+
+.skip_boss_deck
+	ld a, 1
+	call AddToAIScore
+
+; add AI score for both attacks,
+; according to their energy requirements.
+	xor a ; first attack
+	call DetermineAIScoreOfAttackEnergyRequirement
+	ld a, SECOND_ATTACK
+	call DetermineAIScoreOfAttackEnergyRequirement
+
+; store bench score for this card.
+.store_score
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld c, a
+	ld b, $00
+	ld hl, wPlayAreaAIScore
+	add hl, bc
+	ld a, [wAIScore]
+	ld [hl], a
+	pop bc
+	inc b
+	dec c
+	jp nz, .loop_play_area
+
+; the Play Area loop is over and the score
+; for each card has been calculated.
+; now to determine the highest score.
+	call FindPlayAreaCardWithHighestAIScore
+	jp nc, .not_found
+
+	ld a, [wAIEnergyAttachLogicFlags]
+	or a
+	jr z, .play_card
+	scf
+	jp RetrievePlayAreaAIScoreFromBackup1
+
+.play_card
+	call CreateEnergyCardListFromHand
+	jp AITryToPlayEnergyCard
+
+.not_found: ; 1668a (5:668a)
+	ld a, [wAIEnergyAttachLogicFlags]
+	or a
+	jr z, .no_carry
+	jp RetrievePlayAreaAIScoreFromBackup1
+.no_carry
+	or a
+	ret
+
+; checks score related to selected attack,
+; in order to determine whether to play energy card.
+; the AI score is increased/decreased accordingly.
+; input:
+;	[wSelectedAttack] = attack to check.
+DetermineAIScoreOfAttackEnergyRequirement: ; 16695 (5:6695)
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	jp c, .not_enough_energy
+	ld a, ATTACK_FLAG2_ADDRESS | ATTACHED_ENERGY_BOOST_F
+	call CheckLoadedAttackFlag
+	jr c, .attached_energy_boost
+	ld a, ATTACK_FLAG2_ADDRESS | DISCARD_ENERGY_F
+	call CheckLoadedAttackFlag
+	jr c, .discard_energy
+	jp .check_evolution
+
+.attached_energy_boost
+	ld a, [wLoadedAttackEffectParam]
+	cp MAX_ENERGY_BOOST_IS_LIMITED
+	jr z, .check_surplus_energy
+
+	; is MAX_ENERGY_BOOST_IS_NOT_LIMITED,
+	; which is equal to 3, add to score.
+	call AddToAIScore
+	jp .check_evolution
+
+.check_surplus_energy
+	call CheckIfNoSurplusEnergyForAttack
+	jr c, .asm_166cd
+	cp 3 ; check how much surplus energy
+	jr c, .asm_166cd
+
+.asm_166c5
+	ld a, 5
+	call SubFromAIScore
+	jp .check_evolution
+
+.asm_166cd
+	ld a, 2
+	call AddToAIScore
+
+; check whether attack has ATTACHED_ENERGY_BOOST flag
+; and add to AI score if attaching another energy
+; will KO defending Pokémon.
+; add more to score if this is currently active Pokémon.
+	ld a, ATTACK_FLAG2_ADDRESS | ATTACHED_ENERGY_BOOST_F
+	call CheckLoadedAttackFlag
+	jp nc, .check_evolution
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jp c, .check_evolution
+	jp z, .check_evolution
+	ld a, [wDamage]
+	add 10 ; boost gained by attaching another energy card
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	sub b
+	jr c, .attaching_kos_player
+	jr nz, .check_evolution
+
+.attaching_kos_player
+	ld a, 20
+	call AddToAIScore
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .check_evolution
+	ld a, 10
+	call AddToAIScore
+	jr .check_evolution
+
+; checks if there is surplus energy for attack
+; that discards attached energy card.
+; if current card is Zapdos2, don't add to score.
+; if there is no surplus energy, encourage playing energy.
+.discard_energy
+	ld a, [wLoadedCard1ID]
+	cp ZAPDOS2
+	jr z, .check_evolution
+	call CheckIfNoSurplusEnergyForAttack
+	jr c, .asm_166cd
+	jr .asm_166c5
+
+.not_enough_energy
+	ld a, ATTACK_FLAG2_ADDRESS | FLAG_2_BIT_5_F
+	call CheckLoadedAttackFlag
+	jr nc, .check_color_needed
+	ld a, 5
+	call SubFromAIScore
+
+; if the energy card color needed is in hand, increase AI score.
+; if a colorless card is needed, increase AI score.
+.check_color_needed
+	ld a, b
+	or a
+	jr z, .check_colorless_needed
+	ld a, e
+	call LookForCardIDInHand
+	jr c, .check_colorless_needed
+	ld a, 4
+	call AddToAIScore
+	jr .check_total_needed
+.check_colorless_needed
+	ld a, c
+	or a
+	jr z, .check_evolution
+	ld a, 3
+	call AddToAIScore
+
+; if only one energy card is needed for attack,
+; encourage playing energy card.
+.check_total_needed
+	ld a, b
+	add c
+	dec a
+	jr nz, .check_evolution
+	ld a, 3
+	call AddToAIScore
+
+; if the attack KOs player and this is the active card, add to AI score.
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .check_evolution
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jr z, .atk_kos_defending
+	jr nc, .check_evolution
+.atk_kos_defending
+	ld a, 20
+	call AddToAIScore
+
+; this is possibly a bug.
+; this is an identical check as above to test whether this card is active.
+; in case it is active, the score gets added 10 more points,
+; in addition to the 20 points already added above.
+; what was probably intended was to add 20 points
+; plus 10 in case it is the Arena card.
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .check_evolution
+	ld a, 10
+	call AddToAIScore
+
+.check_evolution
+	ld a, [wTempAI] ; evolution in hand
+	cp $ff
+	ret z
+
+; temporarily replace this card with evolution in hand.
+	ld b, a
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	push af
+	ld [hl], b
+
+; check for energy still needed for evolution to attack.
+; if FLAG_2_BIT_5 is not set, check what color is needed.
+; if the energy card color needed is in hand, increase AI score.
+; if a colorless card is needed, increase AI score.
+	call CheckEnergyNeededForAttack
+	jr nc, .done
+	ld a, ATTACK_FLAG2_ADDRESS | FLAG_2_BIT_5_F
+	call CheckLoadedAttackFlag
+	jr c, .done
+	ld a, b
+	or a
+	jr z, .check_colorless_needed_evo
+	ld a, e
+	call LookForCardIDInHand
+	jr c, .check_colorless_needed_evo
+	ld a, 2
+	call AddToAIScore
+	jr .done
+.check_colorless_needed_evo
+	ld a, c
+	or a
+	jr z, .done
+	ld a, 1
+	call AddToAIScore
+
+; recover the original card in the Play Area location.
+.done
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ret
+
+; returns in hTempPlayAreaLocation_ff9d the Play Area location
+; of the card with the highest Play Area AI score, unless
+; the highest score is below $85.
+; if it succeeds in return a card location, set carry.
+; if AI_ENERGY_FLAG_SKIP_ARENA_CARD is set in wAIEnergyAttachLogicFlags
+; doesn't include the Arena card and there's no minimum score.
+FindPlayAreaCardWithHighestAIScore: ; 167b5 (5:67b5)
+	ld a, [wAIEnergyAttachLogicFlags]
+	and AI_ENERGY_FLAG_SKIP_ARENA_CARD
+	jr nz, .only_bench
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, PLAY_AREA_ARENA
+	ld e, c
+	ld d, c
+	ld hl, wPlayAreaAIScore
+; find highest Play Area AI score.
+.loop_1
+	ld a, [hli]
+	cp e
+	jr c, .next_1
+	jr z, .next_1
+	ld e, a ; overwrite highest score found
+	ld d, c ; overwrite Play Area of highest score
+.next_1
+	inc c
+	dec b
+	jr nz, .loop_1
+
+; if highest AI score is below $85, return no carry.
+; else, store Play Area location and return carry.
+	ld a, e
+	cp $85
+	jr c, .not_enough_score
+	ld a, d
+	ldh [hTempPlayAreaLocation_ff9d], a
+	scf
+	ret
+.not_enough_score
+	or a
+	ret
+
+; same as above but only check bench Pokémon scores.
+.only_bench
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	jr z, .no_carry
+
+	ld b, a
+	ld e, 0
+	ld c, PLAY_AREA_BENCH_1
+	ld d, c
+	ld hl, wPlayAreaAIScore + 1
+.loop_2
+	ld a, [hli]
+	cp e
+	jr c, .next_2
+	jr z, .next_2
+	ld e, a ; overwrite highest score found
+	ld d, c ; overwrite Play Area of highest score
+.next_2
+	inc c
+	dec b
+	jr nz, .loop_2
+
+; in this case, there is no minimum threshold AI score.
+	ld a, d
+	ldh [hTempPlayAreaLocation_ff9d], a
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; returns carry if there's an evolution card
+; that can evolve card in hTempPlayAreaLocation_ff9d,
+; and that card needs energy to use wSelectedAttack.
+CheckIfEvolutionNeedsEnergyForAttack: ; 16805 (5:6805)
+	call CreateHandCardList
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call CheckCardEvolutionInHandOrDeck
+	jr c, .has_evolution
+	or a
+	ret
+
+.has_evolution
+	ld b, a
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	push af
+	ld [hl], b
+	call CheckEnergyNeededForAttack
+	jr c, .not_enough_energy
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	or a
+	ret
+
+.not_enough_energy
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	scf
+	ret
+
+; returns in e the card ID of the energy required for
+; the Discard/Energy Boost attack loaded in wSelectedAttack.
+; if it's Zapdos2's Thunderbolt attack, return no carry.
+; if it's Charizard's Fire Spin or Exeggutor's Big Eggsplosion
+; attack, don't return energy card ID, but set carry.
+; output:
+;	b = 1 if needs color energy, 0 otherwise;
+;	c = 1 if only needs colorless energy, 0 otherwise;
+;	carry set if not Zapdos2's Thunderbolt attack.
+GetEnergyCardForDiscardOrEnergyBoostAttack: ; 1683b (5:683b)
+; load card ID and check selected attack index.
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld b, a
+	ld a, [wSelectedAttack]
+	or a
+	jr z, .first_attack
+
+; check if second attack is Zapdos2's Thunderbolt,
+; Charizard's Fire Spin or Exeggutor's Big Eggsplosion,
+; for these to be treated differently.
+; for both attacks, load its energy cost.
+	ld a, b
+	cp ZAPDOS2
+	jr z, .zapdos2
+	cp CHARIZARD
+	jr z, .charizard_or_exeggutor
+	cp EXEGGUTOR
+	jr z, .charizard_or_exeggutor
+	ld hl, wLoadedCard2Atk2EnergyCost
+	jr .fire
+.first_attack
+	ld hl, wLoadedCard2Atk1EnergyCost
+
+; check which energy color the attack requires,
+; and load in e the card ID of corresponding energy card,
+; then return carry flag set.
+.fire
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .grass
+	ld e, FIRE_ENERGY
+	jr .set_carry
+.grass
+	ld a, b
+	and $0f
+	jr z, .lightning
+	ld e, GRASS_ENERGY
+	jr .set_carry
+.lightning
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .water
+	ld e, LIGHTNING_ENERGY
+	jr .set_carry
+.water
+	ld a, b
+	and $0f
+	jr z, .fighting
+	ld e, WATER_ENERGY
+	jr .set_carry
+.fighting
+	ld a, [hli]
+	ld b, a
+	and $f0
+	jr z, .psychic
+	ld e, FIGHTING_ENERGY
+	jr .set_carry
+.psychic
+	ld e, PSYCHIC_ENERGY
+
+.set_carry
+	lb bc, $01, $00
+	scf
+	ret
+
+; for Zapdos2's Thunderbolt attack, return with no carry.
+.zapdos2
+	or a
+	ret
+
+; Charizard's Fire Spin and Exeggutor's Big Eggsplosion,
+; return carry.
+.charizard_or_exeggutor
+	lb bc, $00, $01
+	scf
+	ret
+
+; called after the AI has decided which card to attach
+; energy from hand. AI does checks to determine whether
+; this card needs more energy or not, and chooses the
+; right energy card to play. If the card is played,
+; return with carry flag set.
+AITryToPlayEnergyCard: ; 1689f (5:689f)
+; check if energy cards are still needed for attacks.
+; if first attack doesn't need, test for the second attack.
+	xor a
+	ld [wTempAI], a
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	jr nc, .second_attack
+	ld a, b
+	or a
+	jr nz, .check_deck
+	ld a, c
+	or a
+	jr nz, .check_deck
+
+.second_attack
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	jr nc, .check_discard_or_energy_boost
+	ld a, b
+	or a
+	jr nz, .check_deck
+	ld a, c
+	or a
+	jr nz, .check_deck
+
+; neither attack needs energy cards to be used.
+; check whether these attacks can be given
+; extra energy cards for their effects.
+.check_discard_or_energy_boost
+	ld a, $01
+	ld [wTempAI], a
+
+; for both attacks, check if it has the effect of
+; discarding energy cards or attached energy boost.
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	ld a, ATTACK_FLAG2_ADDRESS | ATTACHED_ENERGY_BOOST_F
+	call CheckLoadedAttackFlag
+	jr c, .energy_boost_or_discard_energy
+	ld a, ATTACK_FLAG2_ADDRESS | DISCARD_ENERGY_F
+	call CheckLoadedAttackFlag
+	jr c, .energy_boost_or_discard_energy
+
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call CheckEnergyNeededForAttack
+	ld a, ATTACK_FLAG2_ADDRESS | ATTACHED_ENERGY_BOOST_F
+	call CheckLoadedAttackFlag
+	jr c, .energy_boost_or_discard_energy
+	ld a, ATTACK_FLAG2_ADDRESS | DISCARD_ENERGY_F
+	call CheckLoadedAttackFlag
+	jr c, .energy_boost_or_discard_energy
+
+; if none of the attacks have those flags, do an additional
+; check to ascertain whether evolution card needs energy
+; to use second attack. Return if all these checks fail.
+	call CheckIfEvolutionNeedsEnergyForAttack
+	ret nc
+	call CreateEnergyCardListFromHand
+	jr .check_deck
+
+; for attacks that discard energy or get boost for
+; additional energy cards, get the energy card ID required by attack.
+; if it's Zapdos2's Thunderbolt attack, return.
+.energy_boost_or_discard_energy
+	call GetEnergyCardForDiscardOrEnergyBoostAttack
+	ret nc
+
+; some decks allow basic Pokémon to be given double colorless
+; in anticipation for evolution, so play card if that is the case.
+.check_deck
+	call CheckSpecificDecksToAttachDoubleColorless
+	jr c, .play_energy_card
+
+	ld a, b
+	or a
+	jr z, .colorless_energy
+
+; in this case, Pokémon needs a specific basic energy card.
+; look for basic energy card needed in hand and play it.
+	ld a, e
+	call LookForCardIDInHand
+	ldh [hTemp_ffa0], a
+	jr nc, .play_energy_card
+
+; in this case Pokémon just needs colorless (any basic energy card).
+; if active card, check if it needs 2 colorless.
+; if it does (and also doesn't additionally need a color energy),
+; look for double colorless card in hand and play it if found.
+.colorless_energy
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a
+	jr nz, .look_for_any_energy
+	ld a, c
+	or a
+	jr z, .check_if_done
+	cp 2
+	jr nz, .look_for_any_energy
+
+	; needs two colorless
+	ld hl, wDuelTempList
+.loop_1
+	ld a, [hli]
+	cp $ff
+	jr z, .look_for_any_energy
+	ldh [hTemp_ffa0], a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp DOUBLE_COLORLESS_ENERGY
+	jr nz, .loop_1
+	jr .play_energy_card
+
+; otherwise, look for any card and play it.
+; if it's a boss deck, only play double colorless in this situation.
+.look_for_any_energy
+	ld hl, wDuelTempList
+	call CountCardsInDuelTempList
+	call ShuffleCards
+.loop_2
+	ld a, [hli]
+	cp $ff
+	jr z, .check_if_done
+	call CheckIfOpponentHasBossDeckID
+	jr nc, .load_card
+	push af
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp DOUBLE_COLORLESS_ENERGY
+	pop bc
+	jr z, .loop_2
+	ld a, b
+.load_card
+	ldh [hTemp_ffa0], a
+
+; plays energy card loaded in hTemp_ffa0 and sets carry flag.
+.play_energy_card
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_PLAY_ENERGY
+	bank1call AIMakeDecision
+	scf
+	ret
+
+; wTempAI is 1 if the attack had a Discard/Energy Boost effect,
+; and 0 otherwise. If 1, then return. If not one, check if
+; there is still a second attack to check.
+.check_if_done
+	ld a, [wTempAI]
+	or a
+	jr z, .check_first_attack
+	ret
+.check_first_attack
+	ld a, [wSelectedAttack]
+	or a
+	jp z, .second_attack
+	ret
+
+; check if playing certain decks so that AI can decide whether to play
+; double colorless to some specific cards.
+; these are cards that do not need double colorless to any of their attacks
+; but are required by their evolutions.
+; return carry if there's a double colorless in hand to attach
+; and it's one of the card IDs from these decks.
+; output:
+;	[hTemp_ffa0] = card index of double colorless in hand;
+;	carry set if can play energy card.
+CheckSpecificDecksToAttachDoubleColorless: ; 1696e (5:696e)
+	push bc
+	push de
+	push hl
+
+; check if AI is playing any of the applicable decks.
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_DRAGONITE_DECK_ID
+	jr z, .legendary_dragonite_deck
+	cp FIRE_CHARGE_DECK_ID
+	jr z, .fire_charge_deck
+	cp LEGENDARY_RONALD_DECK_ID
+	jr z, .legendary_ronald_deck
+
+.no_carry
+	pop hl
+	pop de
+	pop bc
+	or a
+	ret
+
+; if playing Legendary Dragonite deck,
+; check for Charmander and Dratini.
+.legendary_dragonite_deck
+	call .get_id
+	cp CHARMANDER
+	jr z, .check_colorless_attached
+	cp DRATINI
+	jr z, .check_colorless_attached
+	jr .no_carry
+
+; if playing Fire Charge deck,
+; check for Growlithe.
+.fire_charge_deck
+	call .get_id
+	cp GROWLITHE
+	jr z, .check_colorless_attached
+	jr .no_carry
+
+; if playing Legendary Ronald deck,
+; check for Dratini.
+.legendary_ronald_deck
+	call .get_id
+	cp DRATINI
+	jr z, .check_colorless_attached
+	jr .no_carry
+
+; check if card has any colorless energy cards attached,
+; and if there are any, return no carry.
+.check_colorless_attached
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wAttachedEnergies + COLORLESS]
+	or a
+	jr nz, .no_carry
+
+; card has no colorless energy, so look for double colorless
+; in hand and if found, return carry and its card index.
+	ld a, DOUBLE_COLORLESS_ENERGY
+	call LookForCardIDInHand
+	jr c, .no_carry
+	ldh [hTemp_ffa0], a
+	pop hl
+	pop de
+	pop bc
+	scf
+	ret
+
+.get_id:
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ret
diff --git a/src/engine/ai/hand_pokemon.asm b/src/engine/ai/hand_pokemon.asm
new file mode 100644
index 0000000..28ff6b1
--- /dev/null
+++ b/src/engine/ai/hand_pokemon.asm
@@ -0,0 +1,627 @@
+; determine whether AI plays
+; basic cards from hand
+AIDecidePlayPokemonCard: ; 15eae (5:5eae)
+	call CreateHandCardList
+	call SortTempHandByIDList
+	ld hl, wDuelTempList
+	ld de, wHandTempList
+	call CopyHandCardList
+	ld hl, wHandTempList
+
+.next_hand_card
+	ld a, [hli]
+	cp $ff
+	jp z, AIDecideEvolution
+
+	ld [wTempAIPokemonCard], a
+	push hl
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr nc, .skip
+	; skip non-pokemon cards
+
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .skip
+	; skip non-basic pokemon
+
+	ld a, 130
+	ld [wAIScore], a
+	call AIDecidePlayLegendaryBirds
+
+; if Play Area has more than 4 Pokémon, decrease AI score
+; else, increase AI score
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 4
+	jr c, .has_4_or_fewer
+	ld a, 20
+	call SubFromAIScore
+	jr .check_defending_can_ko
+.has_4_or_fewer
+	ld a, 50
+	call AddToAIScore
+
+; if defending Pokémon can KO active card, increase AI score
+.check_defending_can_ko
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .check_energy_cards
+	ld a, 20
+	call AddToAIScore
+
+; if energy cards are found in hand
+; for this card's attacks, raise AI score
+.check_energy_cards
+	ld a, [wTempAIPokemonCard]
+	call GetAttacksEnergyCostBits
+	call CheckEnergyFlagsNeededInList
+	jr nc, .check_evolution_hand
+	ld a, 20
+	call AddToAIScore
+
+; if evolution card is found in hand
+; for this card, raise AI score
+.check_evolution_hand
+	ld a, [wTempAIPokemonCard]
+	call CheckForEvolutionInList
+	jr nc, .check_evolution_deck
+	ld a, 20
+	call AddToAIScore
+
+; if evolution card is found in deck
+; for this card, raise AI score
+.check_evolution_deck
+	ld a, [wTempAIPokemonCard]
+	call CheckForEvolutionInDeck
+	jr nc, .check_score
+	ld a, 10
+	call AddToAIScore
+
+; if AI score is >= 180, play card from hand
+.check_score
+	ld a, [wAIScore]
+	cp 180
+	jr c, .skip
+	ld a, [wTempAIPokemonCard]
+	ldh [hTemp_ffa0], a
+	call CheckIfCardCanBePlayed
+	jr c, .skip
+	ld a, OPPACTION_PLAY_BASIC_PKMN
+	bank1call AIMakeDecision
+	jr c, .done
+.skip
+	pop hl
+	jp .next_hand_card
+.done
+	pop hl
+	ret
+
+; determine whether AI evolves
+; Pokémon in the Play Area
+AIDecideEvolution: ; 15f4c (5:5f4c)
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld de, wHandTempList
+	call CopyHandCardList
+	ld hl, wHandTempList
+
+.next_hand_card
+	ld a, [hli]
+	cp $ff
+	jp z, .done
+	ld [wTempAIPokemonCard], a
+
+; check if Prehistoric Power is active
+; and if so, skip to next card in hand
+	push hl
+	call IsPrehistoricPowerActive
+	jp c, .done_hand_card
+
+; load evolution data to buffer1
+; skip if it's not a Pokémon card
+; and if it's a basic stage card
+	ld a, [wTempAIPokemonCard]
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jp nc, .done_hand_card
+	ld a, [wLoadedCard1Stage]
+	or a
+	jp z, .done_hand_card
+
+; start looping Pokémon in Play Area
+; to find a card to evolve
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+	ld b, 0
+.next_bench_pokemon
+	push bc
+	ld e, b
+	ld a, [wTempAIPokemonCard]
+	ld d, a
+	call CheckIfCanEvolveInto
+	pop bc
+	push bc
+	jp c, .done_bench_pokemon
+
+; store this Play Area location in wTempAI
+; and initialize the AI score
+	ld a, b
+	ld [wTempAI], a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, $80
+	ld [wAIScore], a
+	call AIDecideSpecialEvolutions
+
+; check if the card can use any attacks
+; and if any of those attacks can KO
+	xor a
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr nc, .can_attack
+	ld a, $01
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .cant_attack_or_ko
+.can_attack
+	ld a, $01
+	ld [wCurCardCanAttack], a
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .check_evolution_attacks
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .check_evolution_attacks
+	ld a, $01
+	ld [wCurCardCanKO], a
+	jr .check_evolution_attacks
+.cant_attack_or_ko
+	xor a
+	ld [wCurCardCanAttack], a
+	ld [wCurCardCanKO], a
+
+; check evolution to see if it can use any of its attacks:
+; if it can, raise AI score;
+; if it can't, decrease AI score and if an energy card that is needed
+; can be played from the hand, raise AI score.
+.check_evolution_attacks
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	push af
+	ld a, [wTempAIPokemonCard]
+	ld [hl], a
+	xor a
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr nc, .evolution_can_attack
+	ld a, $01
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .evolution_cant_attack
+.evolution_can_attack
+	ld a, 5
+	call AddToAIScore
+	jr .check_evolution_ko
+.evolution_cant_attack
+	ld a, [wCurCardCanAttack]
+	or a
+	jr z, .check_evolution_ko
+	ld a, 2
+	call SubFromAIScore
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .check_evolution_ko
+	call LookForEnergyNeededInHand
+	jr nc, .check_evolution_ko
+	ld a, 7
+	call AddToAIScore
+
+; if it's an active card:
+; if evolution can't KO but the current card can, lower AI score;
+; if evolution can KO as well, raise AI score.
+.check_evolution_ko
+	ld a, [wCurCardCanAttack]
+	or a
+	jr z, .check_defending_can_ko_evolution
+	ld a, [wTempAI]
+	or a
+	jr nz, .check_defending_can_ko_evolution
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .evolution_cant_ko
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .evolution_cant_ko
+	ld a, 5
+	call AddToAIScore
+	jr .check_defending_can_ko_evolution
+.evolution_cant_ko
+	ld a, [wCurCardCanKO]
+	or a
+	jr z, .check_defending_can_ko_evolution
+	ld a, 20
+	call SubFromAIScore
+
+; if defending Pokémon can KO evolution, lower AI score
+.check_defending_can_ko_evolution
+	ld a, [wTempAI]
+	or a
+	jr nz, .check_mr_mime
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .check_mr_mime
+	ld a, 5
+	call SubFromAIScore
+
+; if evolution can't damage player's Mr Mime, lower AI score
+.check_mr_mime
+	ld a, [wTempAI]
+	call CheckDamageToMrMime
+	jr c, .check_defending_can_ko
+	ld a, 20
+	call SubFromAIScore
+
+; if defending Pokémon can KO current card, raise AI score
+.check_defending_can_ko
+	ld a, [wTempAI]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, [wTempAI]
+	or a
+	jr nz, .check_2nd_stage_hand
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .check_status
+	ld a, 5
+	call AddToAIScore
+
+; if current card has a status condition, raise AI score
+.check_status
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	or a
+	jr z, .check_2nd_stage_hand
+	ld a, 4
+	call AddToAIScore
+
+; if hand has 2nd stage card to evolve evolution card, raise AI score
+.check_2nd_stage_hand
+	ld a, [wTempAIPokemonCard]
+	call CheckForEvolutionInList
+	jr nc, .check_2nd_stage_deck
+	ld a, 2
+	call AddToAIScore
+	jr .check_damage
+
+; if deck has 2nd stage card to evolve evolution card, raise AI score
+.check_2nd_stage_deck
+	ld a, [wTempAIPokemonCard]
+	call CheckForEvolutionInDeck
+	jr nc, .check_damage
+	ld a, 1
+	call AddToAIScore
+
+; decrease AI score proportional to damage
+; AI score -= floor(Damage / 40)
+.check_damage
+	ld a, [wTempAI]
+	ld e, a
+	call GetCardDamageAndMaxHP
+	or a
+	jr z, .check_mysterious_fossil
+	srl a
+	srl a
+	call CalculateByteTensDigit
+	call SubFromAIScore
+
+; if is Mysterious Fossil or
+; wLoadedCard1Unknown2 is set to $02,
+; raise AI score
+.check_mysterious_fossil
+	ld a, [wTempAI]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1ID]
+	cp MYSTERIOUS_FOSSIL
+	jr z, .mysterious_fossil
+	ld a, [wLoadedCard1Unknown2]
+	cp $02
+	jr nz, .pikachu_deck
+	ld a, 2
+	call AddToAIScore
+	jr .pikachu_deck
+
+.mysterious_fossil
+	ld a, 5
+	call AddToAIScore
+
+; in Pikachu Deck, decrease AI score for evolving Pikachu
+.pikachu_deck
+	ld a, [wOpponentDeckID]
+	cp PIKACHU_DECK_ID
+	jr nz, .check_score
+	ld a, [wLoadedCard1ID]
+	cp PIKACHU1
+	jr z, .pikachu
+	cp PIKACHU2
+	jr z, .pikachu
+	cp PIKACHU3
+	jr z, .pikachu
+	cp PIKACHU4
+	jr nz, .check_score
+.pikachu
+	ld a, 3
+	call SubFromAIScore
+
+; if AI score >= 133, go through with the evolution
+.check_score
+	ld a, [wAIScore]
+	cp 133
+	jr c, .done_bench_pokemon
+	ld a, [wTempAI]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wTempAIPokemonCard]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EVOLVE_PKMN
+	bank1call AIMakeDecision
+	pop bc
+	jr .done_hand_card
+
+.done_bench_pokemon
+	pop bc
+	inc b
+	dec c
+	jp nz, .next_bench_pokemon
+.done_hand_card
+	pop hl
+	jp .next_hand_card
+.done
+	or a
+	ret
+
+; determine AI score for evolving
+; Charmeleon, Magikarp, Dragonair and Grimer
+; in certain decks
+AIDecideSpecialEvolutions: ; 16120 (5:6120)
+; check if deck applies
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_DRAGONITE_DECK_ID
+	jr z, .legendary_dragonite
+	cp INVINCIBLE_RONALD_DECK_ID
+	jr z, .invincible_ronald
+	cp LEGENDARY_RONALD_DECK_ID
+	jr z, .legendary_ronald
+	ret
+
+.legendary_dragonite
+	ld a, [wLoadedCard2ID]
+	cp CHARMELEON
+	jr z, .charmeleon
+	cp MAGIKARP
+	jr z, .magikarp
+	cp DRAGONAIR
+	jr z, .dragonair
+	ret
+
+; check if number of energy cards attached to Charmeleon are at least 3
+; and if adding the energy cards in hand makes at least 6 energy cards
+.charmeleon
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call CountNumberOfEnergyCardsAttached
+	cp 3
+	jr c, .not_enough_energy
+	push af
+	farcall CountOppEnergyCardsInHand
+	pop bc
+	add b
+	cp 6
+	jr c, .not_enough_energy
+	ld a, 3
+	call AddToAIScore
+	ret
+.not_enough_energy
+	ld a, 10
+	call SubFromAIScore
+	ret
+
+; check if Magikarp is not the active card
+; and has at least 2 energy cards attached
+.magikarp
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a ; active card
+	ret z
+	ld e, a
+	call CountNumberOfEnergyCardsAttached
+	cp 2
+	ret c
+	ld a, 3
+	call AddToAIScore
+	ret
+
+.invincible_ronald
+	ld a, [wLoadedCard2ID]
+	cp GRIMER
+	jr z, .grimer
+	ret
+
+; check if Grimer is not active card
+.grimer
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a ; active card
+	ret z
+	ld a, 10
+	call AddToAIScore
+	ret
+
+.legendary_ronald
+	ld a, [wLoadedCard2ID]
+	cp DRAGONAIR
+	jr z, .dragonair
+	ret
+
+.dragonair
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	or a ; active card
+	jr z, .is_active
+
+; if Dragonair is benched, check all Pokémon in Play Area
+; and sum all the damage in HP of all cards
+; if this result is >= 70, check if there's
+; a Muk in any duelist's Play Area
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, 0
+.loop
+	dec b
+	ld e, b
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	add c
+	ld c, a
+	ld a, b
+	or a
+	jr nz, .loop
+	ld a, 70
+	cp c
+	jr c, .check_muk
+.lower_score
+	ld a, 10
+	call SubFromAIScore
+	ret
+
+; if there's no Muk, raise score
+.check_muk
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .lower_score
+	ld a, 10
+	call AddToAIScore
+	ret
+
+; if Dragonair is active, check its damage in HP
+; if this result is >= 50,
+; and if at least 3 energy cards attached,
+; check if there's a Muk in any duelist's Play Area
+.is_active
+	ld e, 0
+	call GetCardDamageAndMaxHP
+	cp 50
+	jr c, .lower_score
+	ld e, PLAY_AREA_ARENA
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	cp 3
+	jr c, .lower_score
+	jr .check_muk
+
+; determine AI score for the legendary cards
+; Moltres, Zapdos and Articuno
+AIDecidePlayLegendaryBirds: ; 161d5 (5:61d5)
+; check if deck applies
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_ZAPDOS_DECK_ID
+	jr z, .begin
+	cp LEGENDARY_ARTICUNO_DECK_ID
+	jr z, .begin
+	cp LEGENDARY_RONALD_DECK_ID
+	jr z, .begin
+	ret
+
+; check if card applies
+.begin
+	ld a, [wLoadedCard1ID]
+	cp ARTICUNO2
+	jr z, .articuno
+	cp MOLTRES2
+	jr z, .moltres
+	cp ZAPDOS3
+	jr z, .zapdos
+	ret
+
+.articuno
+	; exit if not enough Pokemon in Play Area
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 2
+	ret c
+
+	call CheckIfActiveCardCanKnockOut
+	jr c, .subtract
+	call CheckIfActivePokemonCanUseAnyNonResidualAttack
+	jr nc, .subtract
+	call AIDecideWhetherToRetreat
+	jr c, .subtract
+
+	; checks for player's active card status
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetNonTurnDuelistVariable
+	and CNF_SLP_PRZ
+	or a
+	jr nz, .subtract
+
+	; checks for player's Pokemon Power
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, $00
+	call CopyAttackDataAndDamage_FromDeckIndex
+	call SwapTurn
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr z, .check_muk_and_snorlax
+
+	; return if no space on the bench
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_BENCH_POKEMON
+	jr c, .check_muk_and_snorlax
+	ret
+
+.check_muk_and_snorlax
+	; checks for Muk in both Play Areas
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .subtract
+	; checks if player's active card is Snorlax
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp SNORLAX
+	jr z, .subtract
+
+; add
+	ld a, 70
+	call AddToAIScore
+	ret
+.subtract
+	ld a, 100
+	call SubFromAIScore
+	ret
+
+.moltres
+	; checks if there's enough cards in deck
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp 56 ; max number of cards not in deck to activate
+	jr nc, .subtract
+	ret
+
+.zapdos
+	; checks for Muk in both Play Areas
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .subtract
+	ret
diff --git a/src/engine/ai/init.asm b/src/engine/ai/init.asm
new file mode 100644
index 0000000..cda2387
--- /dev/null
+++ b/src/engine/ai/init.asm
@@ -0,0 +1,98 @@
+InitAIDuelVars: ; 15636 (5:5636)
+	ld a, $10
+	ld hl, wcda5
+	call ClearMemory_Bank5
+	ld a, 5
+	ld [wAIPokedexCounter], a
+	ld a, $ff
+	ld [wcda5], a
+	ret
+
+; initializes some variables and sets value of wAIBarrierFlagCounter.
+; if Player uses Barrier 3 times in a row, AI checks if Player's deck
+; has only Mewtwo1 Pokemon cards (running a Mewtwo1 mill deck).
+InitAITurnVars: ; 15649 (5:5649)
+; increase Pokedex counter by 1
+	ld a, [wAIPokedexCounter]
+	inc a
+	ld [wAIPokedexCounter], a
+
+	xor a
+	ld [wPreviousAIFlags], a
+	ld [wcddb], a
+	ld [wcddc], a
+	ld [wAIRetreatedThisTurn], a
+
+; checks if the Player used an attack last turn
+; and if it was the second attack of their card.
+	ld a, [wPlayerAttackingAttackIndex]
+	cp $ff
+	jr z, .check_flag
+	or a
+	jr z, .check_flag
+	ld a, [wPlayerAttackingCardIndex]
+	cp $ff
+	jr z, .check_flag
+
+; if the card is Mewtwo1, it means the Player
+; used its second attack, Barrier.
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MEWTWO1
+	jr nz, .check_flag
+	; Player used Barrier last turn
+
+; check if flag was already set, if so,
+; reset wAIBarrierFlagCounter to $80.
+	ld a, [wAIBarrierFlagCounter]
+	bit AI_MEWTWO_MILL_F, a
+	jr nz, .set_flag
+
+; if not, increase it by 1 and check if it exceeds 2.
+	inc a
+	ld [wAIBarrierFlagCounter], a
+	cp 3
+	jr c, .done
+
+; this means that the Player used Barrier
+; at least 3 turns in a row.
+; check if Player is running Mewtwo1-only deck,
+; if so, set wAIBarrierFlagCounter flag.
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MEWTWO1
+	jr nz, .reset_1
+	farcall CheckIfPlayerHasPokemonOtherThanMewtwo1
+	jr nc, .set_flag
+.reset_1
+; reset wAIBarrierFlagCounter
+	xor a
+	ld [wAIBarrierFlagCounter], a
+	jr .done
+
+.set_flag
+	ld a, AI_MEWTWO_MILL
+	ld [wAIBarrierFlagCounter], a
+	jr .done
+
+.check_flag
+; increase counter by 1 if flag is set
+	ld a, [wAIBarrierFlagCounter]
+	bit AI_MEWTWO_MILL_F, a
+	jr z, .reset_2
+	inc a
+	ld [wAIBarrierFlagCounter], a
+	jr .done
+
+.reset_2
+; reset wAIBarrierFlagCounter
+	xor a
+	ld [wAIBarrierFlagCounter], a
+.done
+	ret
diff --git a/src/engine/ai/pkmn_powers.asm b/src/engine/ai/pkmn_powers.asm
new file mode 100644
index 0000000..52a8036
--- /dev/null
+++ b/src/engine/ai/pkmn_powers.asm
@@ -0,0 +1,1228 @@
+; handle AI routines for Energy Trans.
+; uses AI_ENERGY_TRANS_* constants as input:
+;	- AI_ENERGY_TRANS_RETREAT: transfers enough Grass Energy cards to
+;	Arena Pokemon for it to be able to pay the Retreat Cost;
+;	- AI_ENERGY_TRANS_ATTACK: transfers enough Grass Energy cards to
+;	Arena Pokemon for it to be able to use its second attack;
+;	- AI_ENERGY_TRANS_TO_BENCH: transfers all Grass Energy cards from
+;	Arena Pokemon to Bench in case Arena card will be KO'd.
+HandleAIEnergyTrans: ; 2219b (8:619b)
+	ld [wce06], a
+
+; choose to randomly return
+	farcall AIChooseRandomlyNotToDoAction
+	ret c
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	ret z ; return if no Bench cards
+
+	ld a, VENUSAUR2
+	call CountPokemonIDInPlayArea
+	ret nc ; return if no Venusaur2 found in own Play Area
+
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	ret c ; return if Muk found in any Play Area
+
+	ld a, [wce06]
+	cp AI_ENERGY_TRANS_RETREAT
+	jr z, .check_retreat
+
+	cp AI_ENERGY_TRANS_TO_BENCH
+	jp z, AIEnergyTransTransferEnergyToBench
+
+	; AI_ENERGY_TRANS_ATTACK
+	call .CheckEnoughGrassEnergyCardsForAttack
+	ret nc
+	jr .TransferEnergyToArena
+
+.check_retreat
+	call .CheckEnoughGrassEnergyCardsForRetreatCost
+	ret nc
+
+; use Energy Trans to transfer number of Grass energy cards
+; equal to input a from the Bench to the Arena card.
+.TransferEnergyToArena
+	ld [wAINumberOfEnergyTransCards], a
+
+; look for Venusaur2 in Play Area
+; so that its PKMN Power can be used.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	ld b, a
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	ldh [hTempCardIndex_ff9f], a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp VENUSAUR2
+	jr z, .use_pkmn_power
+
+	ld a, b
+	or a
+	ret z ; return when finished Play Area loop
+
+	dec b
+	jr .loop_play_area
+
+; use Energy Trans Pkmn Power
+.use_pkmn_power
+	ld a, b
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hAIEnergyTransPlayAreaLocation], a
+	ld a, [wAINumberOfEnergyTransCards]
+	ld d, a
+
+; look for Grass energy cards that
+; are currently attached to a Bench card.
+	ld e, 0
+.loop_deck_locations
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	and %00011111
+	cp CARD_LOCATION_BENCH_1
+	jr c, .next_card
+
+	and %00001111
+	ldh [hTempPlayAreaLocation_ffa1], a
+
+	ld a, e
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp GRASS_ENERGY
+	jr nz, .next_card
+
+	; store the deck index of energy card
+	ld a, e
+	ldh [hAIEnergyTransEnergyCard], a
+
+	push de
+	ld d, 30
+.small_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .small_delay_loop
+
+	ld a, OPPACTION_6B15
+	bank1call AIMakeDecision
+	pop de
+	dec d
+	jr z, .done_transfer
+
+.next_card
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop_deck_locations
+
+; transfer is done, perform delay
+; and return to main scene.
+.done_transfer
+	ld d, 60
+.big_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .big_delay_loop
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; checks if the Arena card needs energy for its second attack,
+; and if it does, return carry if transferring Grass energy from Bench
+; would be enough to use it. Outputs number of energy cards needed in a.
+.CheckEnoughGrassEnergyCardsForAttack ; 22246 (8:6246)
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp EXEGGUTOR
+	jr z, .is_exeggutor
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	farcall CheckEnergyNeededForAttack
+	jr nc, .attack_false ; return if no energy needed
+
+; check if colorless energy is needed...
+	ld a, c
+	or a
+	jr nz, .count_if_enough
+
+; ...otherwise check if basic energy card is needed
+; and it's grass energy.
+	ld a, b
+	or a
+	jr z, .attack_false
+	ld a, e
+	cp GRASS_ENERGY
+	jr nz, .attack_false
+	ld c, b
+	jr .count_if_enough
+
+.attack_false
+	or a
+	ret
+
+.count_if_enough
+; if there's enough Grass energy cards in Bench
+; to satisfy the attack energy cost, return carry.
+	push bc
+	call .CountGrassEnergyInBench
+	pop bc
+	cp c
+	jr c, .attack_false
+	ld a, c
+	scf
+	ret
+
+.is_exeggutor
+; in case it's Exeggutor in Arena, return carry
+; if there are any Grass energy cards in Bench.
+	call .CountGrassEnergyInBench
+	or a
+	jr z, .attack_false
+
+	scf
+	ret
+
+; outputs in a the number of Grass energy cards
+; currently attached to Bench cards.
+.CountGrassEnergyInBench ; 22286 (8:6286)
+	lb de, 0, 0
+.count_loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	and %00011111
+	cp CARD_LOCATION_BENCH_1
+	jr c, .count_next
+
+; is in bench
+	ld a, e
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp GRASS_ENERGY
+	jr nz, .count_next
+	inc d
+.count_next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .count_loop
+	ld a, d
+	ret
+
+; returns carry if there are enough Grass energy cards in Bench
+; to satisfy the retreat cost of the Arena card.
+; if so, output the number of energy cards still needed in a.
+.CheckEnoughGrassEnergyCardsForRetreatCost ; 222a9 (8:62a9)
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	ld b, a
+	ld e, PLAY_AREA_ARENA
+	farcall CountNumberOfEnergyCardsAttached
+	cp b
+	jr nc, .retreat_false ; return if enough to retreat
+
+; see if there's enough Grass energy cards
+; in the Bench to satisfy retreat cost
+	ld c, a
+	ld a, b
+	sub c
+	ld c, a
+	push bc
+	call .CountGrassEnergyInBench
+	pop bc
+	cp c
+	jr c, .retreat_false ; return if less cards than needed
+
+; output number of cards needed to retreat
+	ld a, c
+	scf
+	ret
+.retreat_false
+	or a
+	ret
+
+; AI logic to determine whether to use Energy Trans Pkmn Power
+; to transfer energy cards attached from the Arena Pokemon to
+; some card in the Bench.
+AIEnergyTransTransferEnergyToBench: ; 222ca (8:62ca)
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfDefendingPokemonCanKnockOut
+	ret nc ; return if Defending can't KO
+
+; processes attacks and see if any attack would be used by AI.
+; if so, return.
+	farcall AIProcessButDontUseAttack
+	ret c
+
+; return if Arena card has no Grass energy cards attached.
+	ld e, PLAY_AREA_ARENA
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wAttachedEnergies + GRASS]
+	or a
+	ret z
+
+; if no energy card attachment is needed, return.
+	farcall AIProcessButDontPlayEnergy_SkipEvolutionAndArena
+	ret nc
+
+; AI decided that an energy card is needed
+; so look for Venusaur2 in Play Area
+; so that its PKMN Power can be used.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	ld b, a
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add b
+	call GetTurnDuelistVariable
+	ldh [hTempCardIndex_ff9f], a
+	ld [wAIVenusaur2DeckIndex], a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp VENUSAUR2
+	jr z, .use_pkmn_power
+
+	ld a, b
+	or a
+	ret z ; return when Play Area loop is ended
+
+	dec b
+	jr .loop_play_area
+
+; use Energy Trans Pkmn Power
+.use_pkmn_power
+	ld a, b
+	ldh [hTemp_ffa0], a
+	ld [wAIVenusaur2PlayAreaLocation], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+
+; loop for each energy cards that are going to be transferred.
+.loop_energy
+	xor a
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wAIVenusaur2PlayAreaLocation]
+	ldh [hTemp_ffa0], a
+
+	; returns when Arena card has no Grass energy cards attached.
+	ld e, PLAY_AREA_ARENA
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wAttachedEnergies + GRASS]
+	or a
+	jr z, .done_transfer
+
+; look for Grass energy cards that
+; are currently attached to Arena card.
+	ld e, 0
+.loop_deck_locations
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp CARD_LOCATION_ARENA
+	jr nz, .next_card
+
+	ld a, e
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp GRASS_ENERGY
+	jr nz, .next_card
+
+	; store the deck index of energy card
+	ld a, e
+	ldh [hAIEnergyTransEnergyCard], a
+	jr .transfer
+
+.next_card
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop_deck_locations
+	jr .done_transfer
+
+.transfer
+; get the Bench card location to transfer Grass energy card to.
+	farcall AIProcessButDontPlayEnergy_SkipEvolutionAndArena
+	jr nc, .done_transfer
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ldh [hAIEnergyTransPlayAreaLocation], a
+
+	ld d, 30
+.small_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .small_delay_loop
+
+	ld a, [wAIVenusaur2DeckIndex]
+	ldh [hTempCardIndex_ff9f], a
+	ld d, a
+	ld e, FIRST_ATTACK_OR_PKMN_POWER
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, OPPACTION_6B15
+	bank1call AIMakeDecision
+	jr .loop_energy
+
+; transfer is done, perform delay
+; and return to main scene.
+.done_transfer
+	ld d, 60
+.big_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .big_delay_loop
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; handles AI logic for using some Pkmn Powers.
+; Pkmn Powers handled here are:
+;	- Heal;
+;	- Shift;
+;	- Peek;
+;	- Strange Behavior;
+;	- Curse.
+; returns carry if turn ended.
+HandleAIPkmnPowers: ; 2237f (8:637f)
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	ccf
+	ret nc ; return no carry if Muk is in play
+
+	farcall AIChooseRandomlyNotToDoAction
+	ccf
+	ret nc ; return no carry if AI randomly decides to
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, PLAY_AREA_ARENA
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	jr nz, .next_2
+
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add c
+	call GetTurnDuelistVariable
+	ld [wce08], a
+
+	push af
+	push bc
+	ld d, a
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld e, FIRST_ATTACK_OR_PKMN_POWER
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	jr z, .execute_effect
+	pop bc
+	jr .next_3
+
+.execute_effect
+	ld a, EFFECTCMDTYPE_INITIAL_EFFECT_2
+	bank1call TryExecuteEffectCommandFunction
+	pop bc
+	jr c, .next_3
+
+; TryExecuteEffectCommandFunction was successful,
+; so check what Pkmn Power this is through card's ID.
+	pop af
+	call GetCardIDFromDeckIndex
+	ld a, e
+	push bc
+
+; check heal
+	cp VILEPLUME
+	jr nz, .check_shift
+	call HandleAIHeal
+	jr .next_1
+.check_shift
+	cp VENOMOTH
+	jr nz, .check_peek
+	call HandleAIShift
+	jr .next_1
+.check_peek
+	cp MANKEY
+	jr nz, .check_strange_behavior
+	call HandleAIPeek
+	jr .next_1
+.check_strange_behavior
+	cp SLOWBRO
+	jr nz, .check_curse
+	call HandleAIStrangeBehavior
+	jr .next_1
+.check_curse
+	cp GENGAR
+	jr nz, .next_1
+	call z, HandleAICurse
+	jr c, .done
+
+.next_1
+	pop bc
+.next_2
+	inc c
+	ld a, c
+	cp b
+	jr nz, .loop_play_area
+	ret
+
+.next_3
+	pop af
+	jr .next_2
+
+.done
+	pop bc
+	ret
+
+; checks whether AI uses Heal on Pokemon in Play Area.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Vileplume.
+HandleAIHeal: ; 22402 (8:6402)
+	ld a, c
+	ldh [hTemp_ffa0], a
+	call .CheckHealTarget
+	ret nc ; return if no target to heal
+	push af
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	pop af
+	ldh [hPlayAreaEffectTarget], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; finds a target suitable for AI to use Heal on.
+; only heals Arena card if the Defending Pokemon
+; cannot KO it after Heal is used.
+; returns carry if target was found and outputs
+; in a the Play Area location of that card.
+.CheckHealTarget ; 22422 (8:6422)
+; check if Arena card has any damage counters,
+; if not, check Bench instead.
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	or a
+	jr z, .check_bench
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .set_carry ; return carry if can't KO
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld h, a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	; this seems useless since it was already
+	; checked that Arena card has damage,
+	; so card damage is at least 10.
+	cp 10 + 1
+	jr c, .check_remaining
+	ld a, 10
+	; a = min(10, CardDamage)
+
+; checks if Defending Pokemon can still KO
+; if Heal is used on this card.
+; if Heal prevents KO, return carry.
+.check_remaining
+	ld l, a
+	ld a, h ; load remaining HP
+	add l ; add 1 counter to account for heal
+	sub d ; subtract damage of strongest opponent attack
+	jr c, .check_bench
+	jr z, .check_bench
+
+.set_carry
+	xor a ; PLAY_AREA_ARENA
+	scf
+	ret
+
+; check Bench for Pokemon with damage counters
+; and find the one with the most damage.
+.check_bench
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	lb bc, 0, 0
+	ld e, PLAY_AREA_BENCH_1
+.loop_bench
+	ld a, e
+	cp d
+	jr z, .done
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	cp b
+	jr c, .next_bench
+	jr z, .next_bench
+	ld b, a ; store this damage
+	ld c, e ; store this Play Area location
+.next_bench
+	inc e
+	jr .loop_bench
+
+; check if a Pokemon with damage counters was found
+; in the Bench and, if so, return carry.
+.done
+	ld a, c
+	or a
+	jr z, .not_found
+; found
+	scf
+	ret
+.not_found
+	or a
+	ret
+
+; checks whether AI uses Shift.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Venomoth
+HandleAIShift: ; 22476 (8:6476)
+	ld a, c
+	or a
+	ret nz ; return if Venomoth is not Arena card
+
+	ldh [hTemp_ffa0], a
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call SwapTurn
+	call GetArenaCardWeakness
+	ld [wAIDefendingPokemonWeakness], a
+	call SwapTurn
+	or a
+	ret z ; return if Defending Pokemon has no weakness
+	and b
+	ret nz ; return if Venomoth is already Defending card's weakness type
+
+; check whether there's a card in play with
+; the same color as the Player's card weakness
+	call .CheckWhetherTurnDuelistHasColor
+	jr c, .found
+	call SwapTurn
+	call .CheckWhetherTurnDuelistHasColor
+	call SwapTurn
+	ret nc ; return if no color found
+
+.found
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+
+; converts WR_* to appropriate color
+	ld a, [wAIDefendingPokemonWeakness]
+	ld b, 0
+.loop_color
+	bit 7, a
+	jr nz, .done
+	inc b
+	rlca
+	jr .loop_color
+
+; use Pkmn Power effect
+.done
+	ld a, b
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; returns carry if turn Duelist has a Pokemon
+; with same color as wAIDefendingPokemonWeakness.
+.CheckWhetherTurnDuelistHasColor ; 224c6 (8:64c6)
+	ld a, [wAIDefendingPokemonWeakness]
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+.loop_play_area
+	ld a, [hli]
+	cp $ff
+	jr z, .false
+	push bc
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	; in case this is a Mysterious Fossil or Clefairy Doll card,
+	; AI might read the type of the card incorrectly here.
+	; uncomment the following lines to account for this
+	; cp TYPE_TRAINER
+	; jr nz, .not_trainer
+	; pop bc
+	; jr .loop_play_area
+; .not_trainer
+	call TranslateColorToWR
+	pop bc
+	and b
+	jr z, .loop_play_area
+; true
+	scf
+	ret
+.false
+	or a
+	ret
+
+; checks whether AI uses Peek.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Mankey.
+HandleAIPeek: ; 224e6 (8:64e6)
+	ld a, c
+	ldh [hTemp_ffa0], a
+	ld a, 50
+	call Random
+	cp 3
+	ret nc ; return 47 out of 50 times
+
+; choose what to use Peek on at random
+	ld a, 3
+	call Random
+	or a
+	jr z, .check_ai_prizes
+	cp 2
+	jr c, .check_player_hand
+
+; check Player's Deck
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetNonTurnDuelistVariable
+	cp DECK_SIZE - 1
+	ret nc ; return if Player has one or no cards in Deck
+	ld a, AI_PEEK_TARGET_DECK
+	jr .use_peek
+
+.check_ai_prizes
+	ld a, DUELVARS_PRIZES
+	call GetTurnDuelistVariable
+	ld hl, wcda5
+	and [hl]
+	ld [hl], a
+	or a
+	ret z ; return if no prizes
+
+	ld c, a
+	ld b, $1
+	ld d, 0
+.loop_prizes
+	ld a, c
+	and b
+	jr nz, .found_prize
+	sla b
+	inc d
+	jr .loop_prizes
+.found_prize
+; remove this prize's flag from the prize list
+; and use Peek on first one in list (lowest bit set)
+	ld a, c
+	sub b
+	ld [hl], a
+	ld a, AI_PEEK_TARGET_PRIZE
+	add d
+	jr .use_peek
+
+.check_player_hand
+	call SwapTurn
+	call CreateHandCardList
+	call SwapTurn
+	or a
+	ret z ; return if no cards in Hand
+; shuffle list and pick the first entry to Peek
+	ld hl, wDuelTempList
+	call CountCardsInDuelTempList
+	call ShuffleCards
+	ld a, [wDuelTempList]
+	or AI_PEEK_TARGET_HAND
+
+.use_peek
+	push af
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	pop af
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; checks whether AI uses Strange Behavior.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Slowbro.
+HandleAIStrangeBehavior: ; 2255d (8:655d)
+	ld a, c
+	or a
+	ret z ; return if Slowbro is Arena card
+
+	ldh [hTemp_ffa0], a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	or a
+	ret z ; return if Arena card has no damage counters
+
+	ld [wce06], a
+	ldh a, [hTemp_ffa0]
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	sub 10
+	ret z ; return if Slowbro has only 10 HP remaining
+
+; if Slowbro can't receive all damage counters,
+; only transfer remaining HP - 10 damage
+	ld hl, wce06
+	cp [hl]
+	jr c, .use_strange_behavior
+	ld a, [hl] ; can receive all damage counters
+
+.use_strange_behavior
+	push af
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	xor a
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	pop af
+
+; loop counters chosen to transfer and use Pkmn Power
+	call ConvertHPToCounters
+	ld e, a
+.loop_counters
+	ld d, 30
+.small_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .small_delay_loop
+	push de
+	ld a, OPPACTION_6B15
+	bank1call AIMakeDecision
+	pop de
+	dec e
+	jr nz, .loop_counters
+
+; return to main scene
+	ld d, 60
+.big_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .big_delay_loop
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; checks whether AI uses Curse.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Gengar.
+HandleAICurse: ; 225b5 (8:65b5)
+	ld a, c
+	ldh [hTemp_ffa0], a
+
+; loop Player's Play Area and checks their damage.
+; finds the card with lowest remaining HP and
+; stores its HP and its Play Area location
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+	lb bc, 0, $ff
+	ld h, PLAY_AREA_ARENA
+	call SwapTurn
+.loop_play_area_1
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	or a
+	jr z, .next_1
+
+	inc b
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	push hl
+	call GetTurnDuelistVariable
+	pop hl
+	cp c
+	jr nc, .next_1
+	; lower HP than one stored
+	ld c, a ; store this HP
+	ld h, e ; store this Play Area location
+
+.next_1
+	inc e
+	ld a, e
+	cp d
+	jr nz, .loop_play_area_1 ; reached end of Play Area
+
+	ld a, 1
+	cp b
+	jr nc, .failed ; return if less than 2 cards with damage
+
+; card in Play Area with lowest HP remaining was found.
+; look for another card to take damage counter from.
+	ld a, h
+	ldh [hTempRetreatCostCards], a
+	ld b, a
+	ld a, 10
+	cp c
+	jr z, .hp_10_remaining
+	; if has more than 10 HP remaining,
+	; skip Arena card in choosing which
+	; card to take damage counter from.
+	ld e, PLAY_AREA_BENCH_1
+	jr .second_card
+
+.hp_10_remaining
+	; if Curse can KO, then include
+	; Player's Arena card to take
+	; damage counter from.
+	ld e, PLAY_AREA_ARENA
+
+.second_card
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+.loop_play_area_2
+	ld a, e
+	cp b
+	jr z, .next_2 ; skip same Pokemon card
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	jr nz, .use_curse ; has damage counters, choose this card
+.next_2
+	inc e
+	ld a, e
+	cp d
+	jr nz, .loop_play_area_2
+
+.failed
+	call SwapTurn
+	or a
+	ret
+
+.use_curse
+	ld a, e
+	ldh [hAIPkmnPowerEffectParam], a
+	call SwapTurn
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+; handles AI logic for Cowardice
+HandleAICowardice: ; 2262d (8:662d)
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	ret c ; return if there's Muk in play
+
+	farcall AIChooseRandomlyNotToDoAction
+	ret c ; randomly return
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 1
+	ret z ; return if only one Pokemon in Play Area
+
+	ld b, a
+	ld c, PLAY_AREA_ARENA
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	jr nz, .next
+.loop
+	ld a, DUELVARS_ARENA_CARD
+	add c
+	call GetTurnDuelistVariable
+	ld [wce08], a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	push bc
+	cp TENTACOOL
+	call z, .CheckWhetherToUseCowardice
+	pop bc
+	jr nc, .next
+
+	dec b ; subtract 1 from number of Pokemon in Play Area
+	ld a, 1
+	cp b
+	ret z ; return if no longer has Bench Pokemon
+	ld c, PLAY_AREA_ARENA ; reset back to Arena
+	jr .loop
+
+.next
+	inc c
+	ld a, c
+	cp b
+	jr nz, .loop
+	ret
+
+; checks whether AI uses Cowardice.
+; return carry if Pkmn Power was used.
+; input:
+;	c = Play Area location (PLAY_AREA_*) of Tentacool.
+.CheckWhetherToUseCowardice ; 22671 (8:6671)
+	ld a, c
+	ldh [hTemp_ffa0], a
+	ld e, a
+	call GetCardDamageAndMaxHP
+.asm_22678
+	or a
+	ret z ; return if has no damage counters
+
+	ldh a, [hTemp_ffa0]
+	or a
+	jr nz, .is_benched
+
+	; this part is buggy if AIDecideBenchPokemonToSwitchTo returns carry
+	; but since this was already checked beforehand, this never happens.
+	; so jr c, .asm_22678 can be safely removed.
+	farcall AIDecideBenchPokemonToSwitchTo
+	jr c, .asm_22678 ; bug, this jumps in the middle of damage checking
+	jr .use_cowardice
+.is_benched
+	ld a, $ff
+.use_cowardice
+	push af
+	ld a, [wce08]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	pop af
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	scf
+	ret
+
+; AI logic for Damage Swap to transfer damage from Arena card
+; to a card in Bench with more than 10 HP remaining
+; and with no energy cards attached.
+HandleAIDamageSwap: ; 226a3 (8:66a3)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	dec a
+	ret z ; return if no Bench Pokemon
+
+	farcall AIChooseRandomlyNotToDoAction
+	ret c
+
+	ld a, ALAKAZAM
+	call CountPokemonIDInPlayArea
+	ret nc ; return if no Alakazam
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	ret c ; return if there's Muk in play
+
+; only take damage off certain cards in Arena
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp ALAKAZAM
+	jr z, .ok
+	cp KADABRA
+	jr z, .ok
+	cp ABRA
+	jr z, .ok
+	cp MR_MIME
+	ret nz
+
+.ok
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	or a
+	ret z ; return if no damage
+
+	call ConvertHPToCounters
+	ld [wce06], a
+	ld a, ALAKAZAM
+	ld b, PLAY_AREA_BENCH_1
+	farcall LookForCardIDInPlayArea_Bank5
+	jr c, .is_in_bench
+
+; Alakazam is Arena card
+	xor a
+.is_in_bench
+	ld [wce08], a
+	call .CheckForDamageSwapTargetInBench
+	ret c ; return if not found
+
+; use Damage Swap
+	ld a, [wce08]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wce08]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+
+	ld a, [wce06]
+	ld e, a
+.loop_damage
+	ld d, 30
+.small_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .small_delay_loop
+
+	push de
+	call .CheckForDamageSwapTargetInBench
+	jr c, .no_more_target
+
+	ldh [hTempRetreatCostCards], a
+	xor a ; PLAY_AREA_ARENA
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_6B15
+	bank1call AIMakeDecision
+	pop de
+	dec e
+	jr nz, .loop_damage
+
+.done
+; return to main scene
+	ld d, 60
+.big_delay_loop
+	call DoFrame
+	dec d
+	jr nz, .big_delay_loop
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	ret
+
+.no_more_target
+	pop de
+	jr .done
+
+; looks for a target in the bench to receive damage counters.
+; returns carry if one is found, and outputs remaining HP in a.
+.CheckForDamageSwapTargetInBench ; 2273c (8:673c)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, PLAY_AREA_BENCH_1
+	lb de, $ff, $ff
+
+; look for candidates in bench to get the damage counters
+; only target specific card IDs.
+.loop_bench
+	ld a, c
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp CHANSEY
+	jr z, .found_candidate
+	cp KANGASKHAN
+	jr z, .found_candidate
+	cp SNORLAX
+	jr z, .found_candidate
+	cp MR_MIME
+	jr z, .found_candidate
+
+.next_play_area
+	inc c
+	ld a, c
+	cp b
+	jr nz, .loop_bench
+
+; done
+	ld a, e
+	cp $ff
+	jr nz, .no_carry
+	ld a, d
+	cp $ff
+	jr z, .set_carry
+.no_carry
+	or a
+	ret
+
+.found_candidate
+; found a potential candidate to receive damage counters
+	ld a, DUELVARS_ARENA_CARD_HP
+	add c
+	call GetTurnDuelistVariable
+	cp 20
+	jr c, .next_play_area ; ignore cards with only 10 HP left
+
+	ld d, c ; store damage
+	push de
+	push bc
+	ld e, c
+	farcall CountNumberOfEnergyCardsAttached
+	pop bc
+	pop de
+	or a
+	jr nz, .next_play_area ; ignore cards with attached energy
+	ld e, c ; store deck index
+	jr .next_play_area
+
+.set_carry
+	scf
+	ret
+
+; handles AI logic for attaching energy cards
+; in Go Go Rain Dance deck.
+HandleAIGoGoRainDanceEnergy: ; 22790 (8:6790)
+	ld a, [wOpponentDeckID]
+	cp GO_GO_RAIN_DANCE_DECK_ID
+	ret nz ; return if not Go Go Rain Dance deck
+
+	ld a, BLASTOISE
+	call CountPokemonIDInPlayArea
+	ret nc ; return if no Blastoise
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	ret c ; return if there's Muk in play
+
+; play all the energy cards that is needed.
+.loop
+	farcall AIProcessAndTryToPlayEnergy
+	jr c, .loop
+	ret
diff --git a/src/engine/ai/retreat.asm b/src/engine/ai/retreat.asm
new file mode 100644
index 0000000..618e859
--- /dev/null
+++ b/src/engine/ai/retreat.asm
@@ -0,0 +1,1009 @@
+; determine AI score for retreating
+; return carry if AI decides to retreat
+AIDecideWhetherToRetreat: ; 158b2 (5:58b2)
+	ld a, [wGotHeadsFromConfusionCheckDuringRetreat]
+	or a
+	jp nz, .no_carry
+	xor a
+	ld [wAIPlayEnergyCardForRetreat], a
+	call LoadDefendingPokemonColorWRAndPrizeCards
+	ld a, $80 ; initial retreat score
+	ld [wAIScore], a
+	ld a, [wcdb4]
+	or a
+	jr z, .check_status
+	srl a
+	srl a
+	sla a
+	call AddToAIScore
+
+.check_status
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	or a
+	jr z, .check_ko_1 ; no status
+	and DOUBLE_POISONED
+	jr z, .check_cnf ; no poison
+	ld a, 2
+	call AddToAIScore
+.check_cnf
+	ld a, [hl]
+	and CNF_SLP_PRZ
+	cp CONFUSED
+	jr nz, .check_ko_1
+	ld a, 1
+	call AddToAIScore
+
+.check_ko_1
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .active_cant_ko_1
+	call CheckIfSelectedAttackIsUnusable
+	jp nc, .active_cant_use_atk
+	call LookForEnergyNeededForAttackInHand
+	jr nc, .active_cant_ko_1
+
+.active_cant_use_atk
+	ld a, 5
+	call SubFromAIScore
+	ld a, [wAIOpponentPrizeCount]
+	cp 2
+	jr nc, .active_cant_ko_1
+	ld a, 35
+	call SubFromAIScore
+
+.active_cant_ko_1
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .defending_cant_ko
+	ld a, 2
+	call AddToAIScore
+
+	call CheckIfNotABossDeckID
+	jr c, .check_resistance_1
+	ld a, [wAIPlayerPrizeCount]
+	cp 2
+	jr nc, .check_prize_count
+	ld a, $01
+	ld [wAIPlayEnergyCardForRetreat], a
+
+.defending_cant_ko
+	call CheckIfNotABossDeckID
+	jr c, .check_resistance_1
+	ld a, [wAIPlayerPrizeCount]
+	cp 2
+	jr nc, .check_prize_count
+	ld a, 2
+	call AddToAIScore
+
+.check_prize_count
+	ld a, [wAIOpponentPrizeCount]
+	cp 2
+	jr nc, .check_resistance_1
+	ld a, 2
+	call SubFromAIScore
+
+.check_resistance_1
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	ld a, [wAIPlayerResistance]
+	and b
+	jr z, .check_weakness_1
+	ld a, 1
+	call AddToAIScore
+
+; check bench for Pokémon that
+; the defending card is not resistant to
+; if one is found, skip SubFromAIScore
+	ld a, [wAIPlayerResistance]
+	ld b, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+.loop_resistance_1
+	ld a, [hli]
+	cp $ff
+	jr z, .exit_loop_resistance_1
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	call TranslateColorToWR
+	and b
+	jr nz, .loop_resistance_1
+	jr .check_weakness_1
+.exit_loop_resistance_1
+	ld a, 2
+	call SubFromAIScore
+
+.check_weakness_1
+	ld a, [wAIPlayerColor]
+	ld b, a
+	call GetArenaCardWeakness
+	and b
+	jr z, .check_resistance_2
+	ld a, 2
+	call AddToAIScore
+
+; check bench for Pokémon that
+; is not weak to defending Pokémon
+; if one is found, skip SubFromAIScore
+	ld a, [wAIPlayerColor]
+	ld b, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+.loop_weakness_1
+	ld a, [hli]
+	cp $ff
+	jr z, .exit_loop_weakness_1
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Weakness]
+	and b
+	jr nz, .loop_weakness_1
+	jr .check_resistance_2
+.exit_loop_weakness_1
+	ld a, 3
+	call SubFromAIScore
+
+.check_resistance_2
+	ld a, [wAIPlayerColor]
+	ld b, a
+	call GetArenaCardResistance
+	and b
+	jr z, .check_weakness_2
+	ld a, 3
+	call SubFromAIScore
+
+; check bench for Pokémon that
+; is the defending Pokémon's weakness
+; if none is found, skip AddToAIScore
+.check_weakness_2
+	ld a, [wAIPlayerWeakness]
+	ld b, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld e, $00
+.loop_weakness_2
+	inc e
+	ld a, [hli]
+	cp $ff
+	jr z, .check_resistance_3
+	push de
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	call TranslateColorToWR
+	pop de
+	and b
+	jr z, .loop_weakness_2
+	ld a, 2
+	call AddToAIScore
+
+	push de
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp PORYGON
+	jr nz, .check_weakness_3
+
+; handle Porygon
+	ld a, e
+	call CheckIfCanDamageDefendingPokemon
+	jr nc, .check_weakness_3
+	ld a, 10
+	call AddToAIScore
+	jr .check_resistance_3
+
+.check_weakness_3
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	ld a, [wAIPlayerWeakness]
+	and b
+	jr z, .check_resistance_3
+	ld a, 3
+	call SubFromAIScore
+
+; check bench for Pokémon that
+; is resistant to defending Pokémon
+; if none is found, skip AddToAIScore
+.check_resistance_3
+	ld a, [wAIPlayerColor]
+	ld b, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+.loop_resistance_2
+	ld a, [hli]
+	cp $ff
+	jr z, .check_ko_2
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Resistance]
+	and b
+	jr z, .loop_resistance_2
+	ld a, 1
+	call AddToAIScore
+
+; check bench for Pokémon that
+; can KO defending Pokémon
+; if none is found, skip AddToAIScore
+.check_ko_2
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld c, 0
+.loop_ko_1
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .check_defending_id
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	push hl
+	push bc
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .no_ko
+	call CheckIfSelectedAttackIsUnusable
+	jr nc, .success
+	call LookForEnergyNeededForAttackInHand
+	jr c, .success
+.no_ko
+	pop bc
+	pop hl
+	jr .loop_ko_1
+.success
+	pop bc
+	pop hl
+	ld a, 2
+	call AddToAIScore
+
+; a bench Pokémon was found that can KO
+; if this is a boss deck and it's at last prize card
+; if arena Pokémon cannot KO, add to AI score
+; and set wAIPlayEnergyCardForRetreat to $01
+
+	ld a, [wAIOpponentPrizeCount]
+	cp 2
+	jr nc, .check_defending_id
+	call CheckIfNotABossDeckID
+	jr c, .check_defending_id
+
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .active_cant_ko_2
+	call CheckIfSelectedAttackIsUnusable
+	jp nc, .check_defending_id
+.active_cant_ko_2
+	ld a, 40
+	call AddToAIScore
+	ld a, $01
+	ld [wAIPlayEnergyCardForRetreat], a
+
+.check_defending_id
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MR_MIME
+	jr z, .mr_mime_or_hitmonlee
+	cp HITMONLEE ; ??
+	jr nz, .check_retreat_cost
+
+; check bench if there's any Pokémon
+; that can damage defending Pokémon
+; this is done because of Mr. Mime's PKMN PWR
+; but why Hitmonlee ($87) as well?
+.mr_mime_or_hitmonlee
+	xor a
+	call CheckIfCanDamageDefendingPokemon
+	jr c, .check_retreat_cost
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld c, 0
+.loop_damage
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .check_retreat_cost
+	ld a, c
+	push hl
+	push bc
+	call CheckIfCanDamageDefendingPokemon
+	jr c, .can_damage
+	pop bc
+	pop hl
+	jr .loop_damage
+.can_damage
+	pop bc
+	pop hl
+	ld a, 5
+	call AddToAIScore
+	ld a, $01
+	ld [wAIPlayEnergyCardForRetreat], a
+
+; subtract from wAIScore if retreat cost is larger than 1
+; then check if any cards have at least half HP,
+; are final evolutions and can use second attack in the bench
+; and adds to wAIScore if the active Pokémon doesn't meet
+; these conditions
+.check_retreat_cost
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	cp 2
+	jr c, .one_or_none
+	cp 3
+	jr nc, .three_or_more
+	; exactly two
+	ld a, 1
+	call SubFromAIScore
+	jr .one_or_none
+
+.three_or_more
+	ld a, 2
+	call SubFromAIScore
+
+.one_or_none
+	call CheckIfArenaCardIsAtHalfHPCanEvolveAndUseSecondAttack
+	jr c, .check_defending_can_ko
+	call CountNumberOfSetUpBenchPokemon
+	cp 2
+	jr c, .check_defending_can_ko
+	call AddToAIScore
+
+; check bench for Pokémon that
+; the defending Pokémon can't knock out
+; if none is found, skip SubFromAIScore
+.check_defending_can_ko
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+	ld e, 0
+.loop_ko_2
+	inc e
+	ld a, [hli]
+	cp $ff
+	jr z, .exit_loop_ko
+	push de
+	push hl
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2ID]
+	pop hl
+	pop de
+	cp MYSTERIOUS_FOSSIL
+	jr z, .loop_ko_2
+	cp CLEFAIRY_DOLL
+	jr z, .loop_ko_2
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	push de
+	push hl
+	call CheckIfDefendingPokemonCanKnockOut
+	pop hl
+	pop de
+	jr c, .loop_ko_2
+	jr .check_active_id
+.exit_loop_ko
+	ld a, 20
+	call SubFromAIScore
+
+.check_active_id
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp MYSTERIOUS_FOSSIL
+	jr z, .mysterious_fossil_or_clefairy_doll
+	cp CLEFAIRY_DOLL
+	jr z, .mysterious_fossil_or_clefairy_doll
+
+; if wAIScore is at least 131, set carry
+	ld a, [wAIScore]
+	cp 131
+	jr nc, .set_carry
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; set carry regardless if active card is
+; either Mysterious Fossil or Clefairy Doll
+; and there's a bench Pokémon who is not KO'd
+; by defending Pokémon and can damage it
+.mysterious_fossil_or_clefairy_doll
+	ld e, 0
+.loop_ko_3
+	inc e
+	ld a, e
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .no_carry
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	push de
+	call CheckIfDefendingPokemonCanKnockOut
+	pop de
+	jr c, .loop_ko_3
+	ld a, e
+	push de
+	call CheckIfCanDamageDefendingPokemon
+	pop de
+	jr nc, .loop_ko_3
+	jr .set_carry
+
+; if player's turn and loaded attack is not a Pokémon Power OR
+; if opponent's turn and wcddb == 0
+; set wcdda's bit 7 flag
+Func_15b54: ; 15b54 (5:5b54)
+	xor a
+	ld [wcdda], a
+	ld a, [wWhoseTurn]
+	cp OPPONENT_TURN
+	jr z, .opponent
+
+; player
+	ld a, [wLoadedAttackCategory]
+	cp POKEMON_POWER
+	ret z
+	jr .set_flag
+
+.opponent
+	ld a, [wcddb]
+	or a
+	ret nz
+
+.set_flag
+	ld a, %10000000
+	ld [wcdda], a
+	ret
+
+; calculates AI score for bench Pokémon
+; returns in a and [hTempPlayAreaLocation_ff9d] the
+; Play Area location of best card to switch to.
+; returns carry if no Bench Pokemon.
+AIDecideBenchPokemonToSwitchTo: ; 15b72 (5:5b72)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 2
+	ret c
+
+; has at least 2 Pokémon in Play Area
+	call Func_15b54
+	call LoadDefendingPokemonColorWRAndPrizeCards
+	ld a, 50
+	ld [wAIScore], a
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, PLAY_AREA_ARENA
+	push bc
+	jp .store_score
+
+.next_bench
+	push bc
+	ld a, c
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld a, 50
+	ld [wAIScore], a
+
+; check if card can KO defending Pokémon
+; if it can, raise AI score
+; if on last prize card, raise AI score again
+	call CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .check_can_use_atks
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .check_can_use_atks
+	ld a, 10
+	call AddToAIScore
+	ld a, [wcdda]
+	or %00000001
+	ld [wcdda], a
+	call CountPrizes
+	cp 2
+	jp nc, .check_defending_weak
+	ld a, 10
+	call AddToAIScore
+
+; calculates damage of both attacks
+; to raise AI score accordingly
+.check_can_use_atks
+	xor a
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	call nc, .HandleAttackDamageScore
+	ld a, $01
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	call nc, .HandleAttackDamageScore
+	jr .check_energy_card
+
+; adds to AI score depending on amount of damage
+; it can inflict to the defending Pokémon
+; AI score += floor(Damage / 10) + 1
+.HandleAttackDamageScore
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	call CalculateByteTensDigit
+	inc a
+	call AddToAIScore
+	ret
+
+; if an energy card that is needed is found in hand
+; calculate damage of the move and raise AI score
+; AI score += floor(Damage / 20)
+.check_energy_card
+	call LookForEnergyNeededInHand
+	jr nc, .check_attached_energy
+	ld a, [wSelectedAttack]
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	call CalculateByteTensDigit
+	srl a
+	call AddToAIScore
+
+; if no energies attached to card, lower AI score
+.check_attached_energy
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld e, a
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	jr nz, .check_mr_mime
+	ld a, 1
+	call SubFromAIScore
+
+; if can damage Mr Mime, raise AI score
+.check_mr_mime
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call LoadCardDataToBuffer2_FromDeckIndex
+	call SwapTurn
+	cp MR_MIME
+	jr nz, .check_defending_weak
+	xor a
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr nz, .can_damage
+	ld a, $01
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr z, .check_defending_weak
+.can_damage
+	ld a, 5
+	call AddToAIScore
+
+; if defending card is weak to this card, raise AI score
+.check_defending_weak
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	call TranslateColorToWR
+	ld c, a
+	ld hl, wAIPlayerWeakness
+	and [hl]
+	jr z, .check_defending_resist
+	ld a, 3
+	call AddToAIScore
+
+; if defending card is resistant to this card, lower AI score
+.check_defending_resist
+	ld a, c
+	ld hl, wAIPlayerResistance
+	and [hl]
+	jr z, .check_resistance
+	ld a, 2
+	call SubFromAIScore
+
+; if this card is resistant to defending Pokémon, raise AI score
+.check_resistance
+	ld a, [wAIPlayerColor]
+	ld hl, wLoadedCard1Resistance
+	and [hl]
+	jr z, .check_weakness
+	ld a, 2
+	call AddToAIScore
+
+; if this card is weak to defending Pokémon, lower AI score
+.check_weakness
+	ld a, [wAIPlayerColor]
+	ld hl, wLoadedCard1Weakness
+	and [hl]
+	jr z, .check_retreat_cost
+	ld a, 3
+	call SubFromAIScore
+
+; if this card's retreat cost < 2, raise AI score
+; if this card's retreat cost > 2, lower AI score
+.check_retreat_cost
+	call GetPlayAreaCardRetreatCost
+	cp 2
+	jr c, .one_or_none
+	jr z, .check_player_prize_count
+	ld a, 1
+	call SubFromAIScore
+	jr .check_player_prize_count
+.one_or_none
+	ld a, 1
+	call AddToAIScore
+
+; if wcdda != $81
+; if defending Pokémon can KO this card
+; if player is not at last prize card, lower 3 from AI score
+; if player is at last prize card, lower 10 from AI score
+.check_player_prize_count
+	ld a, [wcdda]
+	cp %10000000 | %00000001
+	jr z, .check_hp
+	call CheckIfDefendingPokemonCanKnockOut
+	jr nc, .check_hp
+	ld e, 3
+	ld a, [wAIPlayerPrizeCount]
+	cp 1
+	jr nz, .lower_score_1
+	ld e, 10
+.lower_score_1
+	ld a, e
+	call SubFromAIScore
+
+; if this card's HP is 0, make AI score 0
+.check_hp
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	or a
+	jr nz, .add_hp_score
+	ld [wAIScore], a
+	jr .store_score
+
+; AI score += floor(HP/40)
+.add_hp_score
+	ld b, a
+	ld a, 4
+	call CalculateBDividedByA_Bank5
+	call CalculateByteTensDigit
+	call AddToAIScore
+
+; raise AI score if
+;	- is a Mr Mime OR
+;	- is a Mew1 and defending card is not basic stage
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp MR_MIME
+	jr z, .raise_score
+	cp MEW1
+	jr nz, .asm_15cf0
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wLoadedCard2Stage]
+	or a
+	jr z, .asm_15cf0
+.raise_score
+	ld a, 5
+	call AddToAIScore
+
+; if wLoadedCard1Unknown2 == $01, lower AI score
+.asm_15cf0
+	ld a, [wLoadedCard1Unknown2]
+	cp $01
+	jr nz, .mysterious_fossil_or_clefairy_doll
+	ld a, 2
+	call SubFromAIScore
+
+; if card is Mysterious Fossil or Clefairy Doll,
+; lower AI score
+.mysterious_fossil_or_clefairy_doll
+	ld a, [wLoadedCard1ID]
+	cp MYSTERIOUS_FOSSIL
+	jr z, .lower_score_2
+	cp CLEFAIRY_DOLL
+	jr nz, .ai_score_bonus
+.lower_score_2
+	ld a, 10
+	call SubFromAIScore
+
+.ai_score_bonus
+	ld b, a
+	ld a, [wAICardListRetreatBonus + 1]
+	or a
+	jr z, .store_score
+	ld h, a
+	ld a, [wAICardListRetreatBonus]
+	ld l, a
+
+.loop_ids
+	ld a, [hli]
+	or a
+	jr z, .store_score ; list is over
+	cp b
+	jr nz, .next_id
+	ld a, [hl]
+	cp $80
+	jr c, .subtract_score
+	sub $80
+	call AddToAIScore
+	jr .next_id
+.subtract_score
+	ld c, a
+	ld a, $80
+	sub c
+	call SubFromAIScore
+.next_id
+	inc hl
+	jr .loop_ids
+
+.store_score
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	ld c, a
+	ld b, $00
+	ld hl, wPlayAreaAIScore
+	add hl, bc
+	ld a, [wAIScore]
+	ld [hl], a
+	pop bc
+	inc c
+	dec b
+	jp nz, .next_bench
+
+; done
+	xor a
+	ld [wcdb4], a
+	jp FindHighestBenchScore
+
+; handles AI action of retreating Arena Pokémon
+; and chooses which energy cards to discard.
+; if card can't discard, return carry.
+; in case it's Clefairy Doll or Mysterious Fossil,
+; handle its effect to discard itself instead of retreating.
+; input:
+;	- a = Play Area location (PLAY_AREA_*) of card to retreat to.
+AITryToRetreat: ; 15d4f (5:5d4f)
+	push af
+	ld a, [wAIPlayEnergyCardForRetreat]
+	or a
+	jr z, .check_id
+
+; AI is allowed to play an energy card
+; from the hand in order to provide
+; the necessary energy for retreat cost
+
+; check status
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	cp ASLEEP
+	jp z, .check_id
+	cp PARALYZED
+	jp z, .check_id
+
+; if an energy card hasn't been played yet,
+; checks if the Pokémon needs just one more energy to retreat
+; if it does, check if there are any energy cards in hand
+; and if there are, play that energy card
+	ld a, [wAlreadyPlayedEnergy]
+	or a
+	jr nz, .check_id
+	ld e, PLAY_AREA_ARENA
+	call CountNumberOfEnergyCardsAttached
+	push af
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	pop bc
+	cp b
+	jr c, .check_id
+	jr z, .check_id
+	; energy attached < retreat cost
+	sub b
+	cp 1
+	jr nz, .check_id
+	call CreateEnergyCardListFromHand
+	jr c, .check_id
+	ld a, [wDuelTempList]
+	ldh [hTemp_ffa0], a
+	xor a
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_PLAY_ENERGY
+	bank1call AIMakeDecision
+
+.check_id
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp MYSTERIOUS_FOSSIL
+	jp z, .mysterious_fossil_or_clefairy_doll
+	cp CLEFAIRY_DOLL
+	jp z, .mysterious_fossil_or_clefairy_doll
+
+; if card is Asleep or Paralyzed, set carry and exit
+; else, load the status in hTemp_ffa0
+	pop af
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	ld b, a
+	and CNF_SLP_PRZ
+	cp ASLEEP
+	jp z, .set_carry
+	cp PARALYZED
+	jp z, .set_carry
+	ld a, b
+	ldh [hTemp_ffa0], a
+	ld a, $ff
+	ldh [hTempRetreatCostCards], a
+
+; check energy required to retreat
+; if the cost is 0, retreat right away
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	ld [wTempCardRetreatCost], a
+	or a
+	jp z, .retreat
+
+; if cost > 0 and number of energy cards attached == cost
+; discard them all
+	xor a
+	call CreateArenaOrBenchEnergyCardList
+	ld e, PLAY_AREA_ARENA
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	ld c, a
+	ld a, [wTempCardRetreatCost]
+	cp c
+	jr nz, .choose_energy_discard
+
+	ld hl, hTempRetreatCostCards
+	ld de, wDuelTempList
+.loop_1
+	ld a, [de]
+	inc de
+	ld [hli], a
+	cp $ff
+	jr nz, .loop_1
+	jp .retreat
+
+; if cost > 0 and number of energy cards attached > cost
+; choose energy cards to discard according to color
+.choose_energy_discard
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+	ld a, [wTempCardRetreatCost]
+	ld c, a
+
+; first, look for and discard double colorless energy
+; if retreat cost is >= 2
+	ld hl, wDuelTempList
+	ld de, hTempRetreatCostCards
+.loop_2
+	ld a, c
+	cp 2
+	jr c, .energy_not_same_color
+	ld a, [hli]
+	cp $ff
+	jr z, .energy_not_same_color
+	ld [de], a
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp DOUBLE_COLORLESS_ENERGY
+	jr nz, .loop_2
+	ld a, [de]
+	call RemoveCardFromDuelTempList
+	dec hl
+	inc de
+	dec c
+	dec c
+	jr nz, .loop_2
+	jr .end_retreat_list
+
+; second, shuffle attached cards and discard energy cards
+; that are not of the same type as the Pokémon
+; the exception for this are cards that are needed for
+; some attacks but are not of the same color as the Pokémon
+; (i.e. Psyduck's Headache attack)
+; and energy cards attached to Eevee corresponding to a
+; color of any of its evolutions (water, fire, lightning)
+.energy_not_same_color
+	ld hl, wDuelTempList
+	call CountCardsInDuelTempList
+	call ShuffleCards
+.loop_3
+	ld a, [hli]
+	cp $ff
+	jr z, .any_energy
+	ld [de], a
+	call CheckIfEnergyIsUseful
+	jr c, .loop_3
+	ld a, [de]
+	call RemoveCardFromDuelTempList
+	dec hl
+	inc de
+	dec c
+	jr nz, .loop_3
+	jr .end_retreat_list
+
+; third, discard any card until
+; cost requirement is met
+.any_energy
+	ld hl, wDuelTempList
+.loop_4
+	ld a, [hli]
+	cp $ff
+	jr z, .set_carry
+	ld [de], a
+	inc de
+	push de
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp DOUBLE_COLORLESS_ENERGY
+	jr nz, .not_double_colorless
+	dec c
+	jr z, .end_retreat_list
+.not_double_colorless
+	dec c
+	jr nz, .loop_4
+
+.end_retreat_list
+	ld a, $ff
+	ld [de], a
+
+.retreat
+	ld a, OPPACTION_ATTEMPT_RETREAT
+	bank1call AIMakeDecision
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; handle Mysterious Fossil and Clefairy Doll
+; if there are bench Pokémon, use effect to discard card
+; this is equivalent to using its Pokémon Power
+.mysterious_fossil_or_clefairy_doll
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 2
+	jr nc, .has_bench
+	; doesn't have any bench
+	pop af
+	jr .set_carry
+
+.has_bench
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ldh [hTempCardIndex_ff9f], a
+	xor a
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_USE_PKMN_POWER
+	bank1call AIMakeDecision
+	pop af
+	ldh [hAIPkmnPowerEffectParam], a
+	ld a, OPPACTION_EXECUTE_PKMN_POWER_EFFECT
+	bank1call AIMakeDecision
+	ld a, OPPACTION_DUEL_MAIN_SCENE
+	bank1call AIMakeDecision
+	or a
+	ret
diff --git a/src/engine/ai/special_attacks.asm b/src/engine/ai/special_attacks.asm
new file mode 100644
index 0000000..0ed3c8e
--- /dev/null
+++ b/src/engine/ai/special_attacks.asm
@@ -0,0 +1,481 @@
+; this function handles attacks with the SPECIAL_AI_HANDLING set,
+; and makes specific checks in each of these attacks
+; to either return a positive score (value above $80)
+; or a negative score (value below $80).
+; input:
+;	hTempPlayAreaLocation_ff9d = location of card with attack.
+HandleSpecialAIAttacks: ; 16dcd (5:6dcd)
+	ldh a, [hTempPlayAreaLocation_ff9d]
+	add DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+
+	cp NIDORANF
+	jr z, .NidoranFCallForFamily
+	cp ODDISH
+	jr z, .CallForFamily
+	cp BELLSPROUT
+	jr z, .CallForFamily
+	cp EXEGGUTOR
+	jp z, .Teleport
+	cp SCYTHER
+	jp z, .SwordsDanceAndFocusEnergy
+	cp KRABBY
+	jr z, .CallForFamily
+	cp VAPOREON1
+	jp z, .SwordsDanceAndFocusEnergy
+	cp ELECTRODE2
+	jp z, .ChainLightning
+	cp MAROWAK1
+	jr z, .CallForFriend
+	cp MEW3
+	jp z, .DevolutionBeam
+	cp JIGGLYPUFF2
+	jp z, .FriendshipSong
+	cp PORYGON
+	jp z, .Conversion
+	cp MEWTWO3
+	jp z, .EnergyAbsorption
+	cp MEWTWO2
+	jp z, .EnergyAbsorption
+	cp NINETAILS2
+	jp z, .MixUp
+	cp ZAPDOS3
+	jp z, .BigThunder
+	cp KANGASKHAN
+	jp z, .Fetch
+	cp DUGTRIO
+	jp z, .Earthquake
+	cp ELECTRODE1
+	jp z, .EnergySpike
+	cp GOLDUCK
+	jp z, .HyperBeam
+	cp DRAGONAIR
+	jp z, .HyperBeam
+
+; return zero score.
+.zero_score
+	xor a
+	ret
+
+; if any of card ID in a is found in deck,
+; return a score of $80 + slots available in bench.
+.CallForFamily: ; 16e3e (5:6e3e)
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr nc, .zero_score
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_BENCH_POKEMON
+	jr nc, .zero_score
+	ld b, a
+	ld a, MAX_BENCH_POKEMON
+	sub b
+	add $80
+	ret
+
+; if any of NidoranM or NidoranF is found in deck,
+; return a score of $80 + slots available in bench.
+.NidoranFCallForFamily: ; 16e55 (5:6e55)
+	ld e, NIDORANM
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr c, .found_nidoran
+	ld e, NIDORANF
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr nc, .zero_score
+.found_nidoran
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .zero_score
+	ld b, a
+	ld a, MAX_PLAY_AREA_POKEMON
+	sub b
+	add $80
+	ret
+
+; checks for certain card IDs of Fighting color in deck.
+; if any of them are found, return a score of
+; $80 + slots available in bench.
+.CallForFriend: ; 16e77 (5:6e77)
+	ld e, GEODUDE
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr c, .found_fighting_card
+	ld e, ONIX
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr c, .found_fighting_card
+	ld e, CUBONE
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr c, .found_fighting_card
+	ld e, RHYHORN
+	ld a, CARD_LOCATION_DECK
+	call CheckIfAnyCardIDinLocation
+	jr c, .found_fighting_card
+	jr .zero_score
+.found_fighting_card
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_BENCH_POKEMON
+	jr nc, .zero_score
+	ld b, a
+	ld a, MAX_BENCH_POKEMON
+	sub b
+	add $80
+	ret
+
+; if any basic cards are found in deck,
+; return a score of $80 + slots available in bench.
+.FriendshipSong: ; 16ead (5:6ead)
+	call CheckIfAnyBasicPokemonInDeck
+	jr nc, .zero_score
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .zero_score
+	ld b, a
+	ld a, MAX_PLAY_AREA_POKEMON
+	sub b
+	add $80
+	ret
+
+; if AI decides to retreat, return a score of $80 + 10.
+.Teleport: ; 16ec2 (5:6ec2)
+	call AIDecideWhetherToRetreat
+	jp nc, .zero_score
+	ld a, $8a
+	ret
+
+; tests for the following conditions:
+; - player is under No Damage substatus;
+; - second attack is unusable;
+; - second attack deals no damage;
+; if any are true, returns score of $80 + 5.
+.SwordsDanceAndFocusEnergy: ; 16ecb (5:6ecb)
+	ld a, [wAICannotDamage]
+	or a
+	jr nz, .swords_dance_focus_energy_success
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call CheckIfSelectedAttackIsUnusable
+	jr c, .swords_dance_focus_energy_success
+	ld a, SECOND_ATTACK
+	call EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jp nz, .zero_score
+.swords_dance_focus_energy_success
+	ld a, $85
+	ret
+
+; checks player's active card color, then
+; loops through bench looking for a Pokémon
+; with that same color.
+; if none are found, returns score of $80 + 2.
+.ChainLightning: ; 16eea (5:6eea)
+	call SwapTurn
+	call GetArenaCardColor
+	call SwapTurn
+	ld b, a
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+.loop_chain_lightning_bench
+	ld a, [hli]
+	cp $ff
+	jr z, .chain_lightning_success
+	push bc
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	pop bc
+	cp b
+	jr nz, .loop_chain_lightning_bench
+	jp .zero_score
+.chain_lightning_success
+	ld a, $82
+	ret
+
+.DevolutionBeam: ; 16f0f (5:6f0f)
+	call LookForCardThatIsKnockedOutOnDevolution
+	jp nc, .zero_score
+	ld a, $85
+	ret
+
+; first checks if card is confused, and if so return 0.
+; then checks number of Pokémon in bench that are viable to use:
+; - if that number is < 2  and this attack is Conversion 1 OR
+; - if that number is >= 2 and this attack is Conversion 2
+; then return score of $80 + 2.
+; otherwise return score of $80 + 1.
+.Conversion: ; 16f18 (5:6f18)
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	cp CONFUSED
+	jp z, .zero_score
+
+	ld a, [wSelectedAttack]
+	or a
+	jr nz, .conversion_2
+
+; conversion 1
+	call CountNumberOfSetUpBenchPokemon
+	cp 2
+	jr c, .low_conversion_score
+	ld a, $82
+	ret
+
+.conversion_2
+	call CountNumberOfSetUpBenchPokemon
+	cp 2
+	jr nc, .low_conversion_score
+	ld a, $82
+	ret
+
+.low_conversion_score
+	ld a, $81
+	ret
+
+; if any Psychic Energy is found in the Discard Pile,
+; return a score of $80 + 2.
+.EnergyAbsorption: ; 16f41 (5:6f41)
+	ld e, PSYCHIC_ENERGY
+	ld a, CARD_LOCATION_DISCARD_PILE
+	call CheckIfAnyCardIDinLocation
+	jp nc, .zero_score
+	ld a, $82
+	ret
+
+; if player has cards in hand, AI calls Random:
+; - 1/3 chance to encourage attack regardless;
+; - 1/3 chance to dismiss attack regardless;
+; - 1/3 change to make some checks to player's hand.
+; AI tallies number of basic cards in hand, and if this
+; number is >= 2, encourage attack.
+; otherwise, if it finds an evolution card in hand that
+; can evolve a card in player's deck, encourage.
+; if encouraged, returns a score of $80 + 3.
+.MixUp: ; 16f4e (5:6f4e)
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetNonTurnDuelistVariable
+	or a
+	ret z
+
+	ld a, 3
+	call Random
+	or a
+	jr z, .encourage_mix_up
+	dec a
+	ret z
+	call SwapTurn
+	call CreateHandCardList
+	call SwapTurn
+	or a
+	ret z ; return if no hand cards (again)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	cp 3
+	jr nc, .mix_up_check_play_area
+
+	ld hl, wDuelTempList
+	ld b, 0
+.loop_mix_up_hand
+	ld a, [hli]
+	cp $ff
+	jr z, .tally_basic_cards
+	push bc
+	call SwapTurn
+	call LoadCardDataToBuffer2_FromDeckIndex
+	call SwapTurn
+	pop bc
+	ld a, [wLoadedCard2Type]
+	cp TYPE_ENERGY
+	jr nc, .loop_mix_up_hand
+	ld a, [wLoadedCard2Stage]
+	or a
+	jr nz, .loop_mix_up_hand
+	; is a basic Pokémon card
+	inc b
+	jr .loop_mix_up_hand
+.tally_basic_cards
+	ld a, b
+	cp 2
+	jr nc, .encourage_mix_up
+
+; less than 2 basic cards in hand
+.mix_up_check_play_area
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+.loop_mix_up_play_area
+	ld a, [hli]
+	cp $ff
+	jp z, .zero_score
+	push hl
+	call SwapTurn
+	call CheckForEvolutionInList
+	call SwapTurn
+	pop hl
+	jr nc, .loop_mix_up_play_area
+
+.encourage_mix_up
+	ld a, $83
+	ret
+
+; return score of $80 + 3.
+.BigThunder: ; 16fb8 (5:6fb8)
+	ld a, $83
+	ret
+
+; dismiss attack if cards in deck <= 20.
+; otherwise return a score of $80 + 0.
+.Fetch: ; 16fbb (5:6fbb)
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp 41
+	jp nc, .zero_score
+	ld a, $80
+	ret
+
+; dismiss attack if number of own benched cards which would
+; be KOd is greater than or equal to the number
+; of prize cards left for player.
+.Earthquake: ; 16fc8 (5:6fc8)
+	ld a, DUELVARS_BENCH
+	call GetTurnDuelistVariable
+
+	lb de, 0, 0
+.loop_earthquake
+	inc e
+	ld a, [hli]
+	cp $ff
+	jr z, .count_prizes
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	cp 20
+	jr nc, .loop_earthquake
+	inc d
+	jr .loop_earthquake
+
+.count_prizes
+	push de
+	call CountPrizes
+	pop de
+	cp d
+	jp c, .zero_score
+	jp z, .zero_score
+	ld a, $80
+	ret
+
+; if there's any lightning energy cards in deck,
+; return a score of $80 + 3.
+.EnergySpike: ; 16ff2 (5:6ff2)
+	ld a, CARD_LOCATION_DECK
+	ld e, LIGHTNING_ENERGY
+	call CheckIfAnyCardIDinLocation
+	jp nc, .zero_score
+	call AIProcessButDontPlayEnergy_SkipEvolution
+	jp nc, .zero_score
+	ld a, $83
+	ret
+
+; only incentivize attack if player's active card,
+; has any energy cards attached, and if so,
+; return a score of $80 + 3.
+.HyperBeam: ; 17005 (5:7005)
+	call SwapTurn
+	ld e, PLAY_AREA_ARENA
+	call CountNumberOfEnergyCardsAttached
+	call SwapTurn
+	or a
+	jr z, .hyper_beam_neutral
+	ld a, $83
+	ret
+.hyper_beam_neutral
+	ld a, $80
+	ret
+
+; called when second attack is determined by AI to have
+; more AI score than the first attack, so that it checks
+; whether the first attack is a better alternative.
+CheckWhetherToSwitchToFirstAttack: ; 17019 (5:7019)
+; this checks whether the first attack is also viable
+; (has more than minimum score to be used)
+	ld a, [wFirstAttackAIScore]
+	cp $50
+	jr c, .keep_second_attack
+
+; first attack has more than minimum score to be used.
+; check if second attack can KO.
+; in case it can't, the AI keeps it as the attack to be used.
+; (possibly due to the assumption that if the
+; second attack cannot KO, the first attack can't KO as well.)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	jr z, .check_flag
+	jr nc, .keep_second_attack
+
+; second attack can ko, check its flag.
+; in case its effect is to heal user or nullify/weaken damage
+; next turn, keep second attack as the option.
+; otherwise switch to the first attack.
+.check_flag
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, SECOND_ATTACK
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, ATTACK_FLAG2_ADDRESS | HEAL_USER_F
+	call CheckLoadedAttackFlag
+	jr c, .keep_second_attack
+	ld a, ATTACK_FLAG2_ADDRESS | NULLIFY_OR_WEAKEN_ATTACK_F
+	call CheckLoadedAttackFlag
+	jr c, .keep_second_attack
+; switch to first attack
+	xor a
+	ld [wSelectedAttack], a
+	ret
+.keep_second_attack
+	ld a, $01
+	ld [wSelectedAttack], a
+	ret
+
+; returns carry if there are
+; any basic Pokémon cards in deck.
+CheckIfAnyBasicPokemonInDeck: ; 17057 (5:7057)
+	ld e, 0
+.loop
+	ld a, DUELVARS_CARD_LOCATIONS
+	add e
+	call GetTurnDuelistVariable
+	cp CARD_LOCATION_DECK
+	jr nz, .next
+	push de
+	ld a, e
+	call LoadCardDataToBuffer2_FromDeckIndex
+	pop de
+	ld a, [wLoadedCard2Type]
+	cp TYPE_ENERGY
+	jr nc, .next
+	ld a, [wLoadedCard2Stage]
+	or a
+	jr z, .set_carry
+.next
+	inc e
+	ld a, DECK_SIZE
+	cp e
+	jr nz, .loop
+	or a
+	ret
+.set_carry
+	scf
+	ret
diff --git a/src/engine/ai/trainer_cards.asm b/src/engine/ai/trainer_cards.asm
new file mode 100644
index 0000000..cd87a4b
--- /dev/null
+++ b/src/engine/ai/trainer_cards.asm
@@ -0,0 +1,6073 @@
+INCLUDE "data/ai_trainer_card_logic.asm"
+
+_AIProcessHandTrainerCards: ; 200e5 (8:40e5)
+	ld [wce18], a
+; create hand list in wDuelTempList and wTempHandCardList.
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld de, wTempHandCardList
+	call CopyBuffer
+	ld hl, wTempHandCardList
+
+.loop_hand
+	ld a, [hli]
+	ld [wAITrainerCardToPlay], a
+	cp $ff
+	ret z
+
+	push hl
+	ld a, [wce18]
+	ld d, a
+	ld hl, AITrainerCardLogic
+.loop_data
+	xor a
+	ld [wCurrentAIFlags], a
+	ld a, [hli]
+	cp $ff
+	jp z, .pop_hl
+
+; compare input to first byte in data and continue if equal.
+	cp d
+	jp nz, .inc_hl_by_5
+
+	ld a, [hli]
+	ld [wce17], a
+	ld a, [wAITrainerCardToPlay]
+	call LoadCardDataToBuffer1_FromDeckIndex
+
+	cp SWITCH
+	jr nz, .skip_switch_check
+
+	ld b, a
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_SWITCH
+	jr nz, .inc_hl_by_4
+	ld a, b
+
+.skip_switch_check
+; compare hand card to second byte in data and continue if equal.
+	ld b, a
+	ld a, [wce17]
+	cp b
+	jr nz, .inc_hl_by_4
+
+; found Trainer card
+	push hl
+	push de
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+
+; if Headache effects prevent playing card
+; move on to the next item in list.
+	bank1call CheckCantUseTrainerDueToHeadache
+	jp c, .next_in_data
+
+	call LoadNonPokemonCardEffectCommands
+	ld a, EFFECTCMDTYPE_INITIAL_EFFECT_1
+	call TryExecuteEffectCommandFunction
+	jp c, .next_in_data
+
+; AI can randomly choose not to play card.
+	farcall AIChooseRandomlyNotToDoAction
+	jr c, .next_in_data
+
+; call routine to decide whether to play Trainer card
+	pop de
+	pop hl
+	push hl
+	call CallIndirect
+	pop hl
+	jr nc, .inc_hl_by_4
+
+; routine returned carry, which means
+; this card should be played.
+	inc hl
+	inc hl
+	ld [wAITrainerCardParameter], a
+
+; show Play Trainer Card screen
+	push de
+	push hl
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_PLAY_TRAINER
+	bank1call AIMakeDecision
+	pop hl
+	pop de
+	jr c, .inc_hl_by_2
+
+; execute the effects of the Trainer card
+	push hl
+	call CallIndirect
+	pop hl
+
+	inc hl
+	inc hl
+	ld a, [wPreviousAIFlags]
+	ld b, a
+	ld a, [wCurrentAIFlags]
+	or b
+	ld [wPreviousAIFlags], a
+	pop hl
+	and AI_FLAG_MODIFIED_HAND
+	jp z, .loop_hand
+
+; the hand was modified during the Trainer effect
+; so it needs to be re-listed again and
+; looped from the top.
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld de, wTempHandCardList
+	call CopyBuffer
+	ld hl, wTempHandCardList
+; clear the AI_FLAG_MODIFIED_HAND flag
+	ld a, [wPreviousAIFlags]
+	and ~AI_FLAG_MODIFIED_HAND
+	ld [wPreviousAIFlags], a
+	jp .loop_hand
+
+.inc_hl_by_5
+	inc hl
+.inc_hl_by_4
+	inc hl
+	inc hl
+.inc_hl_by_2
+	inc hl
+	inc hl
+	jp .loop_data
+
+.next_in_data
+	pop de
+	pop hl
+	inc hl
+	inc hl
+	inc hl
+	inc hl
+	jp .loop_data
+
+.pop_hl
+	pop hl
+	jp .loop_hand
+
+; makes AI use Potion card.
+AIPlay_Potion: ; 201b5 (8:41b5)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld e, a
+	call GetCardDamageAndMaxHP
+	cp 20
+	jr c, .play_card
+	ld a, 20
+.play_card
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; if AI doesn't decide to retreat this card,
+; check if defending Pokémon can KO active card
+; next turn after using Potion.
+; if it cannot, return carry.
+; also take into account whether attack is high recoil.
+AIDecide_Potion1: ; 201d1 (8:41d1)
+	farcall AIDecideWhetherToRetreat
+	jr c, .no_carry
+	call AICheckIfAttackIsHighRecoil
+	jr c, .no_carry
+	xor a ; active card
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .no_carry
+	ld d, a
+
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld h, a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	cp 20 + 1 ; if damage <= 20
+	jr c, .calculate_hp
+	ld a, 20 ; amount of Potion HP healing
+
+; if damage done by defending Pokémon next turn will still
+; KO this card after healing, return no carry.
+.calculate_hp
+	ld l, a
+	ld a, h
+	add l
+	sub d
+	jr c, .no_carry
+	jr z, .no_carry
+
+; return carry.
+	xor a
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; finds a card in Play Area to use Potion on.
+; output:
+;	a = card to use Potion on;
+;	carry set if Potion should be used.
+AIDecide_Potion2: ; 20204 (8:4204)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .start_from_active
+; can KO
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld h, a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	cp 20 + 1  ; if damage <= 20
+	jr c, .calculate_hp
+	ld a, 20
+; return if using healing prevents KO.
+.calculate_hp
+	ld l, a
+	ld a, h
+	add l
+	sub d
+	jr c, .count_prizes
+	jr z, .count_prizes
+	or a
+	ret
+
+; using Potion on active card does not prevent a KO.
+; if player is at last prize, start loop with active card.
+; otherwise start loop at first bench Pokémon.
+.count_prizes
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	dec a
+	jr z, .start_from_active
+	ld e, PLAY_AREA_BENCH_1
+	jr .loop
+
+; find Play Area Pokémon with more than 10 damage.
+; skip Pokémon if it has a BOOST_IF_TAKEN_DAMAGE attack.
+.start_from_active
+	ld e, PLAY_AREA_ARENA
+.loop
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	ret z
+	call .check_boost_if_taken_damage
+	jr c, .has_boost_damage
+	call GetCardDamageAndMaxHP
+	cp 20 ; if damage >= 20
+	jr nc, .found
+.has_boost_damage
+	inc e
+	jr .loop
+
+; a card was found, now to check if it's active or benched.
+.found
+	ld a, e
+	or a
+	jr z, .active_card
+
+; bench card
+	push de
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	dec a
+	or a
+	jr z, .check_random
+	ld a, 10
+	call Random
+	cp 3
+; 7/10 chance of returning carry.
+.check_random
+	pop de
+	jr c, .no_carry
+	ld a, e
+	scf
+	ret
+
+; return carry for active card if not High Recoil.
+.active_card
+	push de
+	call AICheckIfAttackIsHighRecoil
+	pop de
+	jr c, .no_carry
+	ld a, e
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; return carry if either of the attacks are usable
+; and have the BOOST_IF_TAKEN_DAMAGE effect.
+.check_boost_if_taken_damage ; 2027e (8:427e)
+	push de
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .second_attack
+	ld a, ATTACK_FLAG3_ADDRESS | BOOST_IF_TAKEN_DAMAGE_F
+	call CheckLoadedAttackFlag
+	jr c, .set_carry
+.second_attack
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .false
+	ld a, ATTACK_FLAG3_ADDRESS | BOOST_IF_TAKEN_DAMAGE_F
+	call CheckLoadedAttackFlag
+	jr c, .set_carry
+.false
+	pop de
+	or a
+	ret
+.set_carry
+	pop de
+	scf
+	ret
+
+; makes AI use Super Potion card.
+AIPlay_SuperPotion: ; 202a8 (8:42a8)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	call AIPickEnergyCardToDiscard
+	ldh [hTemp_ffa0], a
+	ld a, [wAITrainerCardParameter]
+	ld e, a
+	call GetCardDamageAndMaxHP
+	cp 40
+	jr c, .play_card
+	ld a, 40
+.play_card
+	ldh [hTempRetreatCostCards], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; if AI doesn't decide to retreat this card and card has
+; any energy cards attached,  check if defending Pokémon can KO
+; active card next turn after using Super Potion.
+; if it cannot, return carry.
+; also take into account whether attack is high recoil.
+AIDecide_SuperPotion1: ; 202cc (8:42cc)
+	farcall AIDecideWhetherToRetreat
+	jr c, .no_carry
+	call AICheckIfAttackIsHighRecoil
+	jr c, .no_carry
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	ld e, a
+	call .check_attached_energy
+	ret nc
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .no_carry
+
+	ld d, a
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld h, a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	cp 40 + 1 ; if damage < 40
+	jr c, .calculate_hp
+	ld a, 40
+.calculate_hp
+	ld l, a
+	ld a, h
+	add l
+	sub d
+	jr c, .no_carry
+	jr z, .no_carry
+
+; return carry
+	ld a, e
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; returns carry if card has energies attached.
+.check_attached_energy ; 20305 (8:4305)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	ret z
+	scf
+	ret
+
+; finds a card in Play Area to use Super Potion on.
+; output:
+;	a = card to use Super Potion on;
+;	carry set if Super Potion should be used.
+AIDecide_SuperPotion2: ; 2030f (8:430f)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .start_from_active
+; can KO
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	ld h, a
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	cp 40 + 1 ; if damage < 40
+	jr c, .calculate_hp
+	ld a, 40
+; return if using healing prevents KO.
+.calculate_hp
+	ld l, a
+	ld a, h
+	add l
+	sub d
+	jr c, .count_prizes
+	jr z, .count_prizes
+	or a
+	ret
+
+; using Super Potion on active card does not prevent a KO.
+; if player is at last prize, start loop with active card.
+; otherwise start loop at first bench Pokémon.
+.count_prizes
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	dec a
+	jr z, .start_from_active
+	ld e, PLAY_AREA_BENCH_1
+	jr .loop
+
+; find Play Area Pokémon with more than 30 damage.
+; skip Pokémon if it doesn't have any energy attached,
+; has a BOOST_IF_TAKEN_DAMAGE attack,
+; or if discarding makes any attack of its attacks unusable.
+.start_from_active
+	ld e, PLAY_AREA_ARENA
+.loop
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	ret z
+	ld d, a
+	call .check_attached_energy
+	jr nc, .next
+	call .check_boost_if_taken_damage
+	jr c, .next
+	call .check_energy_cost
+	jr c, .next
+	call GetCardDamageAndMaxHP
+	cp 40 ; if damage >= 40
+	jr nc, .found
+.next
+	inc e
+	jr .loop
+
+; a card was found, now to check if it's active or benched.
+.found
+	ld a, e
+	or a
+	jr z, .active_card
+
+; bench card
+	push de
+	call SwapTurn
+	call CountPrizes
+	call SwapTurn
+	dec a
+	or a
+	jr z, .check_random
+	ld a, 10
+	call Random
+	cp 3
+; 7/10 chance of returning carry.
+.check_random
+	pop de
+	jr c, .no_carry
+	ld a, e
+	scf
+	ret
+
+; return carry for active card if not Hgh Recoil.
+.active_card
+	push de
+	call AICheckIfAttackIsHighRecoil
+	pop de
+	jr c, .no_carry
+	ld a, e
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; returns carry if card has energies attached.
+.check_attached_energy ; 20394 (8:4394)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	ret z
+	scf
+	ret
+
+; return carry if either of the attacks are usable
+; and have the BOOST_IF_TAKEN_DAMAGE effect.
+.check_boost_if_taken_damage ; 2039e (8:439e)
+	push de
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .second_attack_1
+	ld a, ATTACK_FLAG3_ADDRESS | BOOST_IF_TAKEN_DAMAGE_F
+	call CheckLoadedAttackFlag
+	jr c, .true_1
+.second_attack_1
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .false_1
+	ld a, ATTACK_FLAG3_ADDRESS | BOOST_IF_TAKEN_DAMAGE_F
+	call CheckLoadedAttackFlag
+	jr c, .true_1
+.false_1
+	pop de
+	or a
+	ret
+.true_1
+	pop de
+	scf
+	ret
+
+; returns carry if discarding energy card renders any attack unusable,
+; given that they have enough energy to be used before discarding.
+.check_energy_cost ; 203c8 (8:43c8)
+	push de
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr c, .second_attack_2
+	farcall CheckEnergyNeededForAttackAfterDiscard
+	jr c, .true_2
+
+.second_attack_2
+	pop de
+	push de
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr c, .false_2
+	farcall CheckEnergyNeededForAttackAfterDiscard
+	jr c, .true_2
+
+.false_2
+	pop de
+	or a
+	ret
+.true_2
+	pop de
+	scf
+	ret
+
+AIPlay_Defender: ; 203f8 (8:43f8)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	xor a
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; returns carry if using Defender can prevent a KO
+; by the defending Pokémon.
+; this takes into account both attacks and whether they're useable.
+AIDecide_Defender1: ; 20406 (8:4406)
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .cannot_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry
+
+.cannot_ko
+; check if any of the defending Pokémon's attacks deal
+; damage exactly equal to current HP, and if so,
+; only continue if that attack is useable.
+	farcall CheckIfAnyDefendingPokemonAttackDealsSameDamageAsHP
+	jr nc, .no_carry
+	call SwapTurn
+	farcall CheckIfSelectedAttackIsUnusable
+	call SwapTurn
+	jr c, .no_carry
+
+	ld a, [wSelectedAttack]
+	farcall EstimateDamage_FromDefendingPokemon
+	ld a, [wDamage]
+	ld [wce06], a
+	ld d, a
+
+; load in a the attack that was not selected,
+; and check if it is useable.
+	ld a, [wSelectedAttack]
+	ld b, a
+	ld a, $01
+	sub b
+	ld [wSelectedAttack], a
+	push de
+	call SwapTurn
+	farcall CheckIfSelectedAttackIsUnusable
+	call SwapTurn
+	pop de
+	jr c, .switch_back
+
+; the other attack is useable.
+; compare its damage to the selected attack.
+	ld a, [wSelectedAttack]
+	push de
+	farcall EstimateDamage_FromDefendingPokemon
+	pop de
+	ld a, [wDamage]
+	cp d
+	jr nc, .subtract
+
+; in case the non-selected attack is useable
+; and deals less damage than the selected attack,
+; switch back to the other attack.
+.switch_back
+	ld a, [wSelectedAttack]
+	ld b, a
+	ld a, $01
+	sub b
+	ld [wSelectedAttack], a
+	ld a, [wce06]
+	ld [wDamage], a
+
+; now the selected attack is the one that deals
+; the most damage of the two (and is useable).
+; if subtracting damage by using Defender
+; still prevents a KO, return carry.
+.subtract
+	ld a, [wDamage]
+	sub 20
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	sub d
+	jr c, .no_carry
+	jr z, .no_carry
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; return carry if using Defender prevents Pokémon
+; from being knocked out by an attack with recoil.
+AIDecide_Defender2: ; 20486 (8:4486)
+	ld a, ATTACK_FLAG1_ADDRESS | HIGH_RECOIL_F
+	call CheckLoadedAttackFlag
+	jr c, .recoil
+	ld a, ATTACK_FLAG1_ADDRESS | LOW_RECOIL_F
+	call CheckLoadedAttackFlag
+	jr c, .recoil
+	or a
+	ret
+
+.recoil
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer2_FromDeckIndex
+	ld a, [wSelectedAttack]
+	or a
+	jr nz, .second_attack
+; first attack
+	ld a, [wLoadedCard2Atk1EffectParam]
+	jr .check_weak
+.second_attack
+	ld a, [wLoadedCard2Atk2EffectParam]
+
+; double recoil damage if card is weak to its own color.
+.check_weak
+	ld d, a
+	push de
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call GetArenaCardWeakness
+	and b
+	pop de
+	jr z, .check_resist
+	sla d
+
+; subtract 30 from recoil damage if card resists its own color.
+; if this yields a negative number, return no carry.
+.check_resist
+	push de
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call GetArenaCardResistance
+	and b
+	pop de
+	jr z, .subtract
+	ld a, d
+	sub 30
+	jr c, .no_carry
+	ld d, a
+
+; subtract damage prevented by Defender.
+; if damage still knocks out card, return no carry.
+; if damage does not knock out, return carry.
+.subtract
+	ld a, d
+	or a
+	jr z, .no_carry
+	sub 20
+	ld d, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetTurnDuelistVariable
+	sub d
+	jr c, .no_carry
+	jr z, .no_carry
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+AIPlay_Pluspower: ; 204e8 (8:44e8)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_USED_PLUSPOWER
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardParameter]
+	ld [wAIPluspowerAttack], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; returns carry if using a Pluspower can KO defending Pokémon
+; if active card cannot KO without the boost.
+; outputs in a the attack to use.
+AIDecide_Pluspower1: ; 20501 (8:4501)
+; this is mistakenly duplicated
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+; continue if no attack can knock out.
+; if there's an attack that can, only continue
+; if it's unusable and there's no card in hand
+; to fulfill its energy cost.
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .cannot_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry
+
+; cannot use an attack that knocks out.
+.cannot_ko
+; get active Pokémon's info.
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempTurnDuelistCardID], a
+
+; get defending Pokémon's info and check
+; its No Damage or Effect substatus.
+; if substatus is active, return.
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempNonTurnDuelistCardID], a
+	bank1call HandleNoDamageOrEffectSubstatus
+	call SwapTurn
+	jr c, .no_carry
+
+; check both attacks and decide which one
+; can KO with Pluspower boost.
+; if neither can KO, return no carry.
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	call .check_ko_with_pluspower
+	jr c, .kos_with_pluspower_1
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call .check_ko_with_pluspower
+	jr c, .kos_with_pluspower_2
+
+.no_carry
+	or a
+	ret
+
+; first attack can KO with Pluspower.
+.kos_with_pluspower_1
+	call .check_mr_mime
+	jr nc, .no_carry
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	scf
+	ret
+; second attack can KO with Pluspower.
+.kos_with_pluspower_2
+	call .check_mr_mime
+	jr nc, .no_carry
+	ld a, SECOND_ATTACK
+	scf
+	ret
+
+; return carry if attack is useable and KOs
+; defending Pokémon with Pluspower boost.
+.check_ko_with_pluspower ; 20562 (8:4562)
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .unusable
+	ld a, [wSelectedAttack]
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld hl, wDamage
+	sub [hl]
+	jr c, .no_carry
+	jr z, .no_carry
+	ld a, [hl]
+	add 10 ; add Pluspower boost
+	ld c, a
+	ld a, b
+	sub c
+	ret c ; return carry if damage > HP left
+	ret nz ; does not KO
+	scf
+	ret ; KOs with Pluspower boost
+.unusable
+	or a
+	ret
+
+; returns carry if Pluspower boost does
+; not exceed 30 damage when facing Mr. Mime.
+.check_mr_mime ; 20589 (8:4589)
+	ld a, [wDamage]
+	add 10 ; add Pluspower boost
+	cp 30 ; no danger in preventing damage
+	ret c
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MR_MIME
+	ret z
+; damage is >= 30 but not Mr. Mime
+	scf
+	ret
+
+; returns carry 7/10 of the time
+; if selected attack is useable, can't KO without Pluspower boost
+; can damage Mr. Mime even with Pluspower boost
+; and has a minimum damage > 0.
+; outputs in a the attack to use.
+AIDecide_Pluspower2: ; 205a5 (8:45a5)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call .check_can_ko
+	jr nc, .no_carry
+	call .check_random
+	jr nc, .no_carry
+	call .check_mr_mime
+	jr nc, .no_carry
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+; returns carry if Pluspower boost does
+; not exceed 30 damage when facing Mr. Mime.
+.check_mr_mime ; 205bb (8:45bb)
+	ld a, [wDamage]
+	add 10 ; add Pluspower boost
+	cp 30 ; no danger in preventing damage
+	ret c
+	call SwapTurn
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp MR_MIME
+	ret z
+; damage is >= 30 but not Mr. Mime
+	scf
+	ret
+
+; return carry if attack is useable but cannot KO.
+.check_can_ko ; 205d7 (8:45d7)
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .unusable
+	ld a, [wSelectedAttack]
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld hl, wDamage
+	sub [hl]
+	jr c, .no_carry
+	jr z, .no_carry
+; can't KO.
+	scf
+	ret
+.unusable
+	or a
+	ret
+
+; return carry 7/10 of the time if
+; attack is useable and minimum damage > 0.
+.check_random ; 205f6 (8:45f6)
+	farcall CheckIfSelectedAttackIsUnusable
+	jr c, .unusable
+	ld a, [wSelectedAttack]
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wAIMinDamage]
+	cp 10
+	jr c, .unusable
+	ld a, 10
+	call Random
+	cp 3
+	ret
+
+AIPlay_Switch: ; 20612 (8:4612)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_USED_SWITCH
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	xor a
+	ld [wcdb4], a
+	ret
+
+; returns carry if the active card has less energy cards
+; than the retreat cost and if AI can't play an energy
+; card from the hand to fulfill the cost
+AIDecide_Switch: ; 2062e (8:462e)
+; check if AI can already play an energy card from hand to retreat
+	ld a, [wAIPlayEnergyCardForRetreat]
+	or a
+	jr z, .check_cost_amount
+
+; can't play energy card from hand to retreat
+; compare number of energy cards attached to retreat cost
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	push af
+	ld e, PLAY_AREA_ARENA
+	farcall CountNumberOfEnergyCardsAttached
+	ld b, a
+	pop af
+	sub b
+	; jump if cards attached > retreat cost
+	jr c, .check_cost_amount
+	cp 2
+	; jump if retreat cost is 2 more energy cards
+	; than the number of cards attached
+	jr nc, .switch
+
+.check_cost_amount
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	cp 3
+	; jump if retreat cost >= 3
+	jr nc, .switch
+
+	push af
+	ld e, PLAY_AREA_ARENA
+	farcall CountNumberOfEnergyCardsAttached
+	pop bc
+	cp b
+	; jump if energy cards attached < retreat cost
+	jr c, .switch
+	ret
+
+.switch
+	farcall AIDecideBenchPokemonToSwitchTo
+	ccf
+	ret
+
+AIPlay_GustOfWind: ; 20666 (8:4666)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_USED_GUST_OF_WIND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_GustOfWind: ; 2067e (8:467e)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	dec a
+	or a
+	ret z ; no bench cards
+
+; if used Gust Of Wind already,
+; do not use it again.
+	ld a, [wPreviousAIFlags]
+	and AI_FLAG_USED_GUST_OF_WIND
+	ret nz
+
+	farcall CheckIfActivePokemonCanUseAnyNonResidualAttack
+	ret nc ; no non-residual attack can be used
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .check_id ; if can't KO
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry ; if KO attack is useable
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry ; if energy card is in hand
+
+.check_id
+	; skip if current active card is MEW3 or MEWTWO1
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp MEW3
+	jr z, .no_carry
+	cp MEWTWO1
+	jr z, .no_carry
+
+	call .FindBenchCardToKnockOut
+	ret c
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call .CheckIfNoAttackDealsDamage
+	jr c, .check_bench_energy
+
+	; skip if current arena card's color is
+	; the defending card's weakness
+	call GetArenaCardColor
+	call TranslateColorToWR
+	ld b, a
+	call SwapTurn
+	call GetArenaCardWeakness
+	call SwapTurn
+	and b
+	jr nz, .no_carry
+
+; check weakness
+	call .FindBenchCardWithWeakness
+	ret nc ; no bench card weak to arena card
+	scf
+	ret ; found bench card weak to arena card
+
+.no_carry
+	or a
+	ret
+
+; being here means AI's arena card cannot damage player's arena card
+
+; first check if there is a card in player's bench that
+; has no attached energy cards and that the AI can damage
+.check_bench_energy
+	; return carry if there's a bench card with weakness
+	call .FindBenchCardWithWeakness
+	ret c
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+; loop through bench and check attached energy cards
+.loop_1
+	inc e
+	dec d
+	jr z, .check_bench_hp
+	call SwapTurn
+	call GetPlayAreaCardAttachedEnergies
+	call SwapTurn
+	ld a, [wTotalAttachedEnergies]
+	or a
+	jr nz, .loop_1 ; skip if has energy attached
+	call .CheckIfCanDamageBenchedCard
+	jr nc, .loop_1
+	ld a, e
+	scf
+	ret
+
+.check_bench_hp
+	ld a, $ff
+	ld [wce06], a
+	xor a
+	ld [wce08], a
+	ld e, a
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	ld d, a
+
+; find bench card with least amount of available HP
+.loop_2
+	inc e
+	dec d
+	jr z, .check_found
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld a, [wce06]
+	inc b
+	cp b
+	jr c, .loop_2
+	call .CheckIfCanDamageBenchedCard
+	jr nc, .loop_2
+	dec b
+	ld a, b
+	ld [wce06], a
+	ld a, e
+	ld [wce08], a
+	jr .loop_2
+
+.check_found
+	ld a, [wce08]
+	or a
+	jr z, .no_carry
+; a card was found
+
+.set_carry
+	scf
+	ret
+
+.check_can_damage
+	push bc
+	push hl
+	xor a ; PLAY_AREA_ARENA
+	farcall CheckIfCanDamageDefendingPokemon
+	pop hl
+	pop bc
+	jr nc, .loop_3
+	ld a, c
+	scf
+	ret
+
+; returns carry if any of the player's
+; benched cards is weak to color in b
+; and has a way to damage it
+.FindBenchCardWithWeakness ; 2074d (8:474d)
+	ld a, DUELVARS_BENCH
+	call GetNonTurnDuelistVariable
+	ld c, PLAY_AREA_ARENA
+.loop_3
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	call SwapTurn
+	call LoadCardDataToBuffer1_FromDeckIndex
+	call SwapTurn
+	ld a, [wLoadedCard1Weakness]
+	and b
+	jr nz, .check_can_damage
+	jr .loop_3
+
+; returns carry if neither attack can deal damage
+.CheckIfNoAttackDealsDamage ; 2076b (8:476b)
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	call .CheckIfAttackDealsNoDamage
+	jr c, .second_attack
+	ret
+.second_attack
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	call .CheckIfAttackDealsNoDamage
+	jr c, .true
+	ret
+.true
+	scf
+	ret
+
+; returns carry if attack is Pokemon Power
+; or otherwise doesn't deal any damage
+.CheckIfAttackDealsNoDamage ; 20782 (8:4782)
+	ld a, [wSelectedAttack]
+	ld e, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	ld d, a
+	call CopyAttackDataAndDamage_FromDeckIndex
+	ld a, [wLoadedAttackCategory]
+
+	; skip if attack is a Power or has 0 damage
+	cp POKEMON_POWER
+	jr z, .no_damage
+	ld a, [wDamage]
+	or a
+	ret z
+
+	; check damage against defending card
+	ld a, [wSelectedAttack]
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wAIMaxDamage]
+	or a
+	ret nz
+
+.no_damage
+	scf
+	ret
+
+; returns carry if there is a player's bench card that
+; the opponent's current active card can KO
+.FindBenchCardToKnockOut ; 207a9 (8:47a9)
+	ld a, DUELVARS_BENCH
+	call GetNonTurnDuelistVariable
+	ld e, PLAY_AREA_BENCH_1
+
+.loop_4
+	ld a, [hli]
+	cp $ff
+	ret z
+
+; overwrite the player's active card and its HP
+; with the current bench card that is being checked
+	push hl
+	push de
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	push af
+	ld [hl], b
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	push af
+	ld [hl], b
+
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call .CheckIfAnyAttackKnocksOut
+	jr nc, .next
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .found
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .found
+
+; the following two local routines can be condensed into one
+; since they both revert the player's arena card
+.next
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	pop de
+	inc e
+	pop hl
+	jr .loop_4
+
+; revert player's arena card and set carry
+.found
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	pop de
+	ld a, e
+	pop hl
+	scf
+	ret
+
+; returns carry if any of arena card's attacks
+; KOs player card in location stored in e
+.CheckIfAnyAttackKnocksOut ; 20806 (8:4806)
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	call .CheckIfAttackKnocksOut
+	ret c
+	ld a, SECOND_ATTACK
+
+; returns carry if attack KOs player card
+; in location stored in e
+.CheckIfAttackKnocksOut
+	push de
+	farcall EstimateDamage_VersusDefendingCard
+	pop de
+	ld a, DUELVARS_ARENA_CARD_HP
+	add e
+	call GetNonTurnDuelistVariable
+	ld hl, wDamage
+	sub [hl]
+	ret c
+	ret nz
+	scf
+	ret
+
+; returns carry if opponent's arena card can damage
+; this benched card if it were switched with
+; the player's arena card
+.CheckIfCanDamageBenchedCard ; 20821 (8:4821)
+	push bc
+	push de
+	push hl
+
+	; overwrite arena card data
+	ld a, e
+	add DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	push af
+	ld [hl], b
+
+	; overwrite arena card HP
+	ld a, e
+	add DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	ld b, a
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	push af
+	ld [hl], b
+
+	xor a ; PLAY_AREA_ARENA
+	farcall CheckIfCanDamageDefendingPokemon
+	jr c, .can_damage
+
+; the following two local routines can be condensed into one
+; since they both revert the player's arena card
+
+; can't damage
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	pop hl
+	pop de
+	pop bc
+	or a
+	ret
+
+.can_damage
+	ld a, DUELVARS_ARENA_CARD_HP
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	pop af
+	ld [hl], a
+	pop hl
+	pop de
+	pop bc
+	scf
+	ret
+
+AIPlay_Bill: ; 2086d (8:486d)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; return carry if cards in deck > 9
+AIDecide_Bill: ; 20878 (8:4878)
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 9
+	ret
+
+AIPlay_EnergyRemoval: ; 20880 (8:4880)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; picks an energy card in the player's Play Area to remove
+AIDecide_EnergyRemoval: ; 20895 (8:4895)
+; check if the current active card can KO player's card
+; if it's possible to KO, then do not consider the player's
+; active card to remove its attached energy
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .cannot_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .can_ko
+	farcall LookForEnergyNeededForAttackInHand
+	jr nc, .cannot_ko
+
+.can_ko
+	; start checking from the bench
+	ld a, PLAY_AREA_BENCH_1
+	ld [wce0f], a
+	jr .check_bench_energy
+.cannot_ko
+	; start checking from the arena card
+	xor a ; PLAY_AREA_ARENA
+	ld [wce0f], a
+
+; loop each card and check if it has enough energy to use any attack
+; if it does, then proceed to pick an energy card to remove
+.check_bench_energy
+	call SwapTurn
+	ld a, [wce0f]
+	ld e, a
+.loop_1
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .default
+
+	ld d, a
+	call .CheckIfCardHasEnergyAttached
+	jr nc, .next_1
+	call .CheckIfNotEnoughEnergyToAttack
+	jr nc, .pick_energy ; jump if enough energy to attack
+.next_1
+	inc e
+	jr .loop_1
+
+.pick_energy
+; a play area card was picked to remove energy
+; store the picked energy card to remove in wce1a
+; and set carry
+	ld a, e
+	push af
+	call PickAttachedEnergyCardToRemove
+	ld [wce1a], a
+	pop af
+	call SwapTurn
+	scf
+	ret
+
+; if no card in player's Play Area was found with enough energy
+; to attack, just pick an energy card from player's active card
+; (in case the AI cannot KO it this turn)
+.default
+	ld a, [wce0f]
+	or a
+	jr nz, .check_bench_damage ; not active card
+	call .CheckIfCardHasEnergyAttached
+	jr c, .pick_energy
+
+; lastly, check what attack on player's Play Area is highest damaging
+; and pick an energy card attached to that Pokemon to remove
+.check_bench_damage
+	xor a
+	ld [wce06], a
+	ld [wce08], a
+
+	ld e, PLAY_AREA_BENCH_1
+.loop_2
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .found_damage
+
+	ld d, a
+	call .CheckIfCardHasEnergyAttached
+	jr nc, .next_2
+	call .FindHighestDamagingAttack
+.next_2
+	inc e
+	jr .loop_2
+
+.found_damage
+	ld a, [wce08]
+	or a
+	jr z, .no_carry ; skip if none found
+	ld e, a
+	jr .pick_energy
+.no_carry
+	call SwapTurn
+	or a
+	ret
+
+; returns carry if this card has any energy cards attached
+.CheckIfCardHasEnergyAttached ; 2091a (8:491a)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	or a
+	ret z
+	scf
+	ret
+
+; returns carry if this card does not
+; have enough energy for either of its attacks
+.CheckIfNotEnoughEnergyToAttack ; 20924 (8:4924)
+	push de
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr nc, .enough_energy
+	pop de
+
+	push de
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr nc, .check_surplus
+	pop de
+
+; neither attack has enough energy
+	scf
+	ret
+
+.enough_energy
+	pop de
+	or a
+	ret
+
+; first attack doesn't have enough energy (or is just a Pokemon Power)
+; but second attack has enough energy to be used
+; check if there's surplus energy for attack and, if so, return carry
+.check_surplus
+	farcall CheckIfNoSurplusEnergyForAttack
+	pop de
+	ccf
+	ret
+
+; stores in wce06 the highest damaging attack
+; for the card in play area location in e
+; and stores this card's location in wce08
+.FindHighestDamagingAttack ; 2094f (8:494f)
+	push de
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr z, .skip_1
+	ld e, a
+	ld a, [wce06]
+	cp e
+	jr nc, .skip_1
+	ld a, e
+	ld [wce06], a ; store this damage value
+	pop de
+	ld a, e
+	ld [wce08], a ; store this location
+	jr .second_attack
+
+.skip_1
+	pop de
+
+.second_attack
+	push de
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+	ld a, SECOND_ATTACK
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr z, .skip_2
+	ld e, a
+	ld a, [wce06]
+	cp e
+	jr nc, .skip_2
+	ld a, e
+	ld [wce06], a ; store this damage value
+	pop de
+	ld a, e
+	ld [wce08], a ; store this location
+	ret
+.skip_2
+	pop de
+	ret
+
+AIPlay_SuperEnergyRemoval: ; 20994 (8:4994)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wce1b]
+	ldh [hTempRetreatCostCards], a
+	ld a, [wce1c]
+	ldh [hTempRetreatCostCards + 1], a
+	ld a, [wce1d]
+	ldh [hTempRetreatCostCards + 2], a
+	ld a, $ff
+	ldh [hTempRetreatCostCards + 3], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; picks two energy cards in the player's Play Area to remove
+AIDecide_SuperEnergyRemoval: ; 209bc (8:49bc)
+	ld e, PLAY_AREA_BENCH_1
+.loop_1
+; first find an Arena card with a color energy card
+; to discard for card effect
+; return immediately if no Arena cards
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .exit
+
+	ld d, a
+	push de
+	call .LookForNonDoubleColorless
+	pop de
+	jr c, .not_double_colorless
+	inc e
+	jr .loop_1
+
+; returns carry if an energy card other than double colorless
+; is found attached to the card in play area location e
+.LookForNonDoubleColorless
+	ld a, e
+	call CreateArenaOrBenchEnergyCardList
+	ld hl, wDuelTempList
+.loop_2
+	ld a, [hli]
+	cp $ff
+	ret z
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp DOUBLE_COLORLESS_ENERGY
+	; any basic energy card
+	; will set carry flag here
+	jr nc, .loop_2
+	ret
+
+.exit
+	or a
+	ret
+
+; card in Play Area location e was found with
+; a basic energy card
+.not_double_colorless
+	ld a, e
+	ld [wce0f], a
+
+; check if the current active card can KO player's card
+; if it's possible to KO, then do not consider the player's
+; active card to remove its attached energy
+	xor a ; PLAY_AREA_ARENA
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .cannot_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .can_ko
+	farcall LookForEnergyNeededForAttackInHand
+	jr nc, .cannot_ko
+
+.can_ko
+	; start checking from the bench
+	call SwapTurn
+	ld e, PLAY_AREA_BENCH_1
+	jr .loop_3
+.cannot_ko
+	; start checking from the arena card
+	call SwapTurn
+	ld e, PLAY_AREA_ARENA
+
+; loop each card and check if it has enough energy to use any attack
+; if it does, then proceed to pick energy cards to remove
+.loop_3
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .no_carry
+
+	ld d, a
+	call .CheckIfFewerThanTwoEnergyCards
+	jr c, .next_1
+	call .CheckIfNotEnoughEnergyToAttack
+	jr nc, .found_card ; jump if enough energy to attack
+.next_1
+	inc e
+	jr .loop_3
+
+.found_card
+; a play area card was picked to remove energy
+; if this is not the Arena Card, then check
+; entire bench to pick the highest damage
+	ld a, e
+	or a
+	jr nz, .check_bench_damage
+
+; store the picked energy card to remove in wce1a
+; and set carry
+.pick_energy
+	ld [wce1b], a
+	call PickTwoAttachedEnergyCards
+	ld [wce1c], a
+	ld a, b
+	ld [wce1d], a
+	call SwapTurn
+	ld a, [wce0f]
+	push af
+	call AIPickEnergyCardToDiscard
+	ld [wce1a], a
+	pop af
+	scf
+	ret
+
+; check what attack on player's Play Area is highest damaging
+; and pick an energy card attached to that Pokemon to remove
+.check_bench_damage
+	xor a
+	ld [wce06], a
+	ld [wce08], a
+
+	ld e, PLAY_AREA_BENCH_1
+.loop_4
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	call GetTurnDuelistVariable
+	cp $ff
+	jr z, .found_damage
+
+	ld d, a
+	call .CheckIfFewerThanTwoEnergyCards
+	jr c, .next_2
+	call .CheckIfNotEnoughEnergyToAttack
+	jr c, .next_2
+	call .FindHighestDamagingAttack
+.next_2
+	inc e
+	jr .loop_4
+
+.found_damage
+	ld a, [wce08]
+	or a
+	jr z, .no_carry
+	jr .pick_energy
+.no_carry
+	call SwapTurn
+	or a
+	ret
+
+; returns carry if the number of energy cards attached
+; is fewer than 2, or if all energy combined yields
+; fewer than 2 energy
+.CheckIfFewerThanTwoEnergyCards ; 20a77 (8:4a77)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	cp 2
+	ret c ; return if fewer than 2 attached cards
+
+; count all energy attached
+; i.e. colored energy card = 1
+; and double colorless energy card = 2
+	xor a
+	ld b, NUM_COLORED_TYPES
+	ld hl, wAttachedEnergies
+.loop_5
+	add [hl]
+	inc hl
+	dec b
+	jr nz, .loop_5
+	ld b, [hl]
+	srl b
+	add b
+	cp 2
+	ret
+
+; returns carry if this card does not
+; have enough energy for either of its attacks
+.CheckIfNotEnoughEnergyToAttack ; 20a92 (8:4a92)
+	push de
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr nc, .enough_energy
+	pop de
+
+	push de
+	ld a, SECOND_ATTACK
+	ld [wSelectedAttack], a
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+	farcall CheckEnergyNeededForAttack
+	jr nc, .check_surplus
+	pop de
+
+; neither attack has enough energy
+	scf
+	ret
+
+.enough_energy
+	pop de
+	or a
+	ret
+
+; first attack doesn't have enough energy (or is just a Pokemon Power)
+; but second attack has enough energy to be used
+; check if there's surplus energy for attack and, if so,
+; return carry if this surplus energy is at least 2
+.check_surplus
+	farcall CheckIfNoSurplusEnergyForAttack
+	cp 2
+	jr c, .enough_energy
+	pop de
+	scf
+	ret
+
+; stores in wce06 the highest damaging attack
+; for the card in play area location in e
+; and stores this card's location in wce08
+.FindHighestDamagingAttack ; 20ac1 (8:4ac1)
+	push de
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+	xor a ; FIRST_ATTACK_OR_PKMN_POWER
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr z, .skip_1
+	ld e, a
+	ld a, [wce06]
+	cp e
+	jr nc, .skip_1
+	ld a, e
+	ld [wce06], a ; store this damage value
+	pop de
+	ld a, e
+	ld [wce08], a ; store this location
+	jr .second_attack
+
+.skip_1
+	pop de
+
+.second_attack
+	push de
+	ld a, e
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+	ld a, SECOND_ATTACK
+	farcall EstimateDamage_VersusDefendingCard
+	ld a, [wDamage]
+	or a
+	jr z, .skip_2
+	ld e, a
+	ld a, [wce06]
+	cp e
+	jr nc, .skip_2
+	ld a, e
+	ld [wce06], a ; store this damage value
+	pop de
+	ld a, e
+	ld [wce08], a ; store this location
+	ret
+.skip_2
+	pop de
+	ret
+
+AIPlay_PokemonBreeder: ; 20b06 (8:4b06)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wce1a]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_PokemonBreeder: ; 20b1b (8:4b1b)
+	call IsPrehistoricPowerActive
+	jp c, .done
+
+	ld a, 7
+	ld hl, wce08
+	call ClearMemory_Bank8
+
+	xor a
+	ld [wce06], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+
+.loop_hand_1
+	ld a, [hli]
+	cp $ff
+	jr z, .not_found_in_hand
+
+; check if card in hand is any of the following
+; stage 2 Pokemon cards
+	ld d, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp VENUSAUR1
+	jr z, .found
+	cp VENUSAUR2
+	jr z, .found
+	cp BLASTOISE
+	jr z, .found
+	cp VILEPLUME
+	jr z, .found
+	cp ALAKAZAM
+	jr z, .found
+	cp GENGAR
+	jr nz, .loop_hand_1
+
+.found
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	push hl
+	call GetTurnDuelistVariable
+	pop hl
+	ld c, a
+	ld e, PLAY_AREA_ARENA
+
+; check Play Area for card that can evolve into
+; the picked stage 2 Pokemon
+.loop_play_area_1
+	push hl
+	push bc
+	push de
+	call CheckIfCanEvolveInto_BasicToStage2
+	pop de
+	call nc, .can_evolve
+	pop bc
+	pop hl
+	inc e
+	dec c
+	jr nz, .loop_play_area_1
+	jr .loop_hand_1
+
+.can_evolve
+	ld a, DUELVARS_ARENA_CARD_HP
+	add e
+	call GetTurnDuelistVariable
+	call ConvertHPToCounters
+	swap a
+	ld b, a
+
+; count number of energy cards attached and keep
+; the lowest 4 bits (capped at $0f)
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	cp $10
+	jr c, .not_maxed_out
+	ld a, %00001111
+.not_maxed_out
+	or b
+
+; 4 high bits of a = HP counters Pokemon still has
+; 4 low  bits of a = number of energy cards attached
+
+; store this score in wce08 + PLAY_AREA*
+	ld hl, wce08
+	ld c, e
+	ld b, $00
+	add hl, bc
+	ld [hl], a
+
+; store the deck index of stage 2 Pokemon in wce0f + PLAY_AREA*
+	ld hl, wce0f
+	add hl, bc
+	ld [hl], d
+
+; increase wce06 by one
+	ld hl, wce06
+	inc [hl]
+	ret
+
+.not_found_in_hand
+	ld a, [wce06]
+	or a
+	jr z, .check_evolution_and_dragonite
+
+; an evolution has been found before
+	xor a
+	ld [wce06], a
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+	ld e, $00
+	ld d, $00
+
+; find highest score in wce08
+.loop_score_1
+	ld hl, wce08
+	add hl, de
+	ld a, [wce06]
+	cp [hl]
+	jr nc, .not_higher
+
+; store this score to wce06
+	ld a, [hl]
+	ld [wce06], a
+; store this PLay Area location to wce07
+	ld a, e
+	ld [wce07], a
+
+.not_higher
+	inc e
+	dec c
+	jr nz, .loop_score_1
+
+; store the deck index of the stage 2 card
+; that has been decided in wce1a,
+; return the Play Area location of card
+; to evolve in a and return carry
+	ld a, [wce07]
+	ld e, a
+	ld hl, wce0f
+	add hl, de
+	ld a, [hl]
+	ld [wce1a], a
+	ld a, [wce07]
+	scf
+	ret
+
+.check_evolution_and_dragonite
+	ld a, 7
+	ld hl, wce08
+	call ClearMemory_Bank8
+
+	xor a
+	ld [wce06], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	push hl
+
+.loop_hand_2
+	pop hl
+	ld a, [hli]
+	cp $ff
+	jr z, .check_evolution_found
+
+	push hl
+	ld d, a
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area_2
+; check if evolution is possible
+	push bc
+	push de
+	call CheckIfCanEvolveInto_BasicToStage2
+	pop de
+	call nc, .HandleDragonite1Evolution
+	call nc, .can_evolve
+
+; not possible to evolve or returned carry
+; when handling Dragonite1 evolution
+	pop bc
+	inc e
+	dec c
+	jr nz, .loop_play_area_2
+	jr .loop_hand_2
+
+.check_evolution_found
+	ld a, [wce06]
+	or a
+	jr nz, .evolution_was_found
+; no evolution was found before
+	or a
+	ret
+
+.evolution_was_found
+	xor a
+	ld [wce06], a
+	ld a, $ff
+	ld [wce07], a
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld c, a
+	ld e, $00
+	ld d, $00
+
+; find highest score in wce08 with at least
+; 2 energy cards attached
+.loop_score_2
+	ld hl, wce08
+	add hl, de
+	ld a, [wce06]
+	cp [hl]
+	jr nc, .next_score
+
+; take the lower 4 bits (total energy cards)
+; and skip if less than 2
+	ld a, [hl]
+	ld b, a
+	and %00001111
+	cp 2
+	jr c, .next_score
+
+; has at least 2 energy cards
+; store the score in wce06
+	ld a, b
+	ld [wce06], a
+; store this PLay Area location to wce07
+	ld a, e
+	ld [wce07], a
+
+.next_score
+	inc e
+	dec c
+	jr nz, .loop_score_2
+
+	ld a, [wce07]
+	cp $ff
+	jr z, .done
+
+; a card to evolve was found
+; store the deck index of the stage 2 card
+; that has been decided in wce1a,
+; return the Play Area location of card
+; to evolve in a and return carry
+	ld e, a
+	ld hl, wce0f
+	add hl, de
+	ld a, [hl]
+	ld [wce1a], a
+	ld a, [wce07]
+	scf
+	ret
+
+.done
+	or a
+	ret
+
+; return carry if card is evolving to Dragonite1 and if
+; - the card that is evolving is not Arena card and
+;   number of damage counters in Play Area is under 8;
+; - the card that is evolving is Arena card and has under 5
+;   damage counters or has less than 3 energy cards attached.
+.HandleDragonite1Evolution ; 20c5c (8:4c5c)
+	push af
+	push bc
+	push de
+	push hl
+	push de
+
+; check card ID
+	ld a, d
+	call GetCardIDFromDeckIndex
+	ld a, e
+	pop de
+	cp DRAGONITE1
+	jr nz, .no_carry
+
+; check card Play Area location
+	ld a, e
+	or a
+	jr z, .active_card_dragonite
+
+; the card that is evolving is not active card
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld b, a
+	ld c, 0
+
+; count damage counters in Play Area
+.loop_play_area_damage
+	dec b
+	ld e, b
+	push bc
+	call GetCardDamageAndMaxHP
+	pop bc
+	call ConvertHPToCounters
+	add c
+	ld c, a
+
+	ld a, b
+	or a
+	jr nz, .loop_play_area_damage
+
+; compare number of total damage counters
+; with 7, if less or equal to that, set carry
+	ld a, 7
+	cp c
+	jr c, .no_carry
+	jr .set_carry
+
+.active_card_dragonite
+; the card that is evolving is active card
+; compare number of this card's damage counters
+; with 5, if less than that, set carry
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	cp 5
+	jr c, .set_carry
+
+; compare number of this card's attached energy cards
+; with 3, if less than that, set carry
+	ld e, PLAY_AREA_ARENA
+	farcall CountNumberOfEnergyCardsAttached
+	cp 3
+	jr c, .set_carry
+	jr .no_carry
+
+.no_carry
+	pop hl
+	pop de
+	pop bc
+	pop af
+	ret
+
+.set_carry
+	pop hl
+	pop de
+	pop bc
+	pop af
+	scf
+	ret
+
+AIPlay_ProfessorOak: ; 20cae (8:4cae)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_USED_PROFESSOR_OAK | AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; sets carry if AI determines a score of playing
+; Professor Oak is over a certain threshold.
+AIDecide_ProfessorOak: ; 20cc1 (8:4cc1)
+; return if cards in deck <= 6
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 6
+	ret nc
+
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_ARTICUNO_DECK_ID
+	jp z, .HandleLegendaryArticunoDeck
+	cp EXCAVATION_DECK_ID
+	jp z, .HandleExcavationDeck
+	cp WONDERS_OF_SCIENCE_DECK_ID
+	jp z, .HandleWondersOfScienceDeck
+
+; return if cards in deck <= 14
+.check_cards_deck
+	ld a, [hl]
+	cp DECK_SIZE - 14
+	ret nc
+
+; initialize score
+	ld a, $1e
+	ld [wce06], a
+
+; check number of cards in hand
+.check_cards_hand
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 4
+	jr nc, .more_than_3_cards
+
+; less than 4 cards in hand
+	ld a, [wce06]
+	add $32
+	ld [wce06], a
+	jr .check_energy_cards
+
+.more_than_3_cards
+	cp 9
+	jr c, .check_energy_cards
+
+; more than 8 cards
+	ld a, [wce06]
+	sub $1e
+	ld [wce06], a
+
+.check_energy_cards
+	farcall CreateEnergyCardListFromHand
+	jr nc, .handle_blastoise
+
+; no energy cards in hand
+	ld a, [wce06]
+	add $28
+	ld [wce06], a
+
+.handle_blastoise
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .check_hand
+
+; no Muk in Play Area
+	ld a, BLASTOISE
+	call CountPokemonIDInPlayArea
+	jr nc, .check_hand
+
+; at least one Blastoise in AI Play Area
+	ld a, WATER_ENERGY
+	farcall LookForCardIDInHand
+	jr nc, .check_hand
+
+; no Water energy in hand
+	ld a, [wce06]
+	add $0a
+	ld [wce06], a
+
+; this part seems buggy
+; the AI loops through all the cards in hand and checks
+; if any of them is not a Pokemon card and has Basic stage.
+; it seems like the intention was that if there was
+; any Basic Pokemon still in hand, the AI would add to the score.
+.check_hand
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.loop_hand
+	ld a, [hli]
+	cp $ff
+	jr z, .check_evolution
+
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr c, .loop_hand ; bug, should be jr nc
+
+	ld a, [wLoadedCard1Stage]
+	or a
+	jr nz, .loop_hand
+
+	ld a, [wce06]
+	add $0a
+	ld [wce06], a
+
+.check_evolution
+	xor a
+	ld [wce0f], a
+	ld [wce0f + 1], a
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area
+	push de
+	call .LookForEvolution
+	pop de
+	jr nc, .not_in_hand
+
+; there's a card in hand that can evolve
+	ld a, $01
+	ld [wce0f], a
+
+.not_in_hand
+; check if a card that can evolve was found at all
+; if not, go to the next card in the Play Area
+	ld a, [wce08]
+	cp $01
+	jr nz, .next_play_area
+
+; if it was found, set wce0f + 1 to $01
+	ld a, $01
+	ld [wce0f + 1], a
+
+.next_play_area
+	inc e
+	dec d
+	jr nz, .loop_play_area
+
+; if a card was found that evolves...
+	ld a, [wce0f + 1]
+	or a
+	jr z, .check_score
+
+; ...but that card is not in the hand...
+	ld a, [wce0f]
+	or a
+	jr nz, .check_score
+
+; ...add to the score
+	ld a, [wce06]
+	add $0a
+	ld [wce06], a
+
+; only return carry if score >  $3c
+.check_score
+	ld a, [wce06]
+	ld b, $3c
+	cp b
+	jr nc, .set_carry
+	or a
+	ret
+
+.set_carry
+	scf
+	ret
+
+; return carry if there's a card in the hand that
+; can evolve the card in Play Area location in e.
+; sets wce08 to $01 if any card is found that can
+; evolve regardless of card location.
+.LookForEvolution ; 20d9d (8:4d9d)
+	xor a
+	ld [wce08], a
+	ld d, 0
+
+; loop through the whole deck to check if there's
+; a card that can evolve this Pokemon.
+.loop_deck_evolution
+	push de
+	call CheckIfCanEvolveInto
+	pop de
+	jr nc, .can_evolve
+.evolution_not_in_hand
+	inc d
+	ld a, DECK_SIZE
+	cp d
+	jr nz, .loop_deck_evolution
+
+	or a
+	ret
+
+; a card was found that can evolve, set wce08 to $01
+; and if the card is in the hand, return carry.
+; otherwise resume looping through deck.
+.can_evolve
+	ld a, $01
+	ld [wce08], a
+	ld a, DUELVARS_CARD_LOCATIONS
+	add d
+	call GetTurnDuelistVariable
+	cp CARD_LOCATION_HAND
+	jr nz, .evolution_not_in_hand
+
+	scf
+	ret
+
+; handles Legendary Articuno Deck AI logic.
+.HandleLegendaryArticunoDeck ; 20dc3 (8:4dc3)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 3
+	jr nc, .check_playable_cards
+
+; has less than 3 Pokemon in Play Area.
+	push af
+	call CreateHandCardList
+	pop af
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+; if no cards in hand evolve cards in Play Area,
+; returns carry.
+.loop_play_area_articuno
+	ld a, DUELVARS_ARENA_CARD
+	add e
+
+	push de
+	call GetTurnDuelistVariable
+	farcall CheckForEvolutionInList
+	pop de
+	jr c, .check_playable_cards
+
+	inc e
+	ld a, d
+	cp e
+	jr nz, .loop_play_area_articuno
+
+.set_carry_articuno
+	scf
+	ret
+
+; if there are more than 3 energy cards in hand,
+; return no carry, otherwise check for playable cards.
+.check_playable_cards
+	call CountOppEnergyCardsInHand
+	cp 4
+	jr nc, .no_carry_articuno
+
+; remove both Professor Oak cards from list
+; before checking for playable cards
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld e, PROFESSOR_OAK
+	farcall RemoveCardIDInList
+	ld e, PROFESSOR_OAK
+	farcall RemoveCardIDInList
+
+; look in hand for cards that can be played.
+; if a card that cannot be played is found, return no carry.
+; otherwise return carry.
+.loop_hand_articuno
+	ld a, [hli]
+	cp $ff
+	jr z, .set_carry_articuno
+	push hl
+	farcall CheckIfCardCanBePlayed
+	pop hl
+	jr c, .loop_hand_articuno
+
+.no_carry_articuno
+	or a
+	ret
+
+; handles Excavation deck AI logic.
+; sets score depending on whether there's no
+; Mysterious Fossil in play and in hand.
+.HandleExcavationDeck ; 20e11 (8:4e11)
+; return no carry if cards in deck < 15
+	ld a, [hl]
+	cp 46
+	ret nc
+
+; look for Mysterious Fossil
+	ld a, MYSTERIOUS_FOSSIL
+	call LookForCardIDInHandAndPlayArea
+	jr c, .found_mysterious_fossil
+	ld a, $50
+	ld [wce06], a
+	jp .check_cards_hand
+.found_mysterious_fossil
+	ld a, $1e
+	ld [wce06], a
+	jp .check_cards_hand
+
+; handles Wonders of Science AI logic.
+; if there's either Grimer or Muk in hand,
+; do not play Professor Oak.
+.HandleWondersOfScienceDeck ; 20e2c (8:4e2c)
+	ld a, GRIMER
+	call LookForCardIDInHandList_Bank8
+	jr c, .found_grimer_or_muk
+	ld a, MUK
+	call LookForCardIDInHandList_Bank8
+	jr c, .found_grimer_or_muk
+
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	jp .check_cards_deck
+
+.found_grimer_or_muk
+	or a
+	ret
+
+AIPlay_EnergyRetrieval: ; 20e44 (8:4e44)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wce1b]
+	ldh [hTempRetreatCostCards], a
+	cp $ff
+	jr z, .asm_20e68
+	ld a, $ff
+	ldh [$ffa3], a
+.asm_20e68
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; checks whether AI can play Energy Retrieval and
+; picks the energy cards from the discard pile,
+; and duplicate cards in hand to discard.
+AIDecide_EnergyRetrieval: ; 20e6e (8:4e6e)
+; return no carry if no cards in hand
+	farcall CreateEnergyCardListFromHand
+	jp nc, .no_carry
+
+; handle Go Go Rain Dance deck
+; return no carry if there's no Muk card in play and
+; if there's no Blastoise card in Play Area
+; if there's a Muk in play, continue as normal
+	ld a, [wOpponentDeckID]
+	cp GO_GO_RAIN_DANCE_DECK_ID
+	jr nz, .start
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .start
+	ld a, BLASTOISE
+	call CountPokemonIDInPlayArea
+	jp nc, .no_carry
+
+.start
+; find duplicate cards in hand
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	call FindDuplicateCards
+	jp c, .no_carry
+
+	ld [wce06], a
+	ld a, CARD_LOCATION_DISCARD_PILE
+	call FindBasicEnergyCardsInLocation
+	jp c, .no_carry
+
+; some basic energy cards were found in Discard Pile
+	ld a, $ff
+	ld [wce1a], a
+	ld [wce1b], a
+	ld [wce1c], a
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+; first check if there are useful energy cards in the list
+; and choose them for retrieval first
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+
+; load this card's ID in wTempCardID
+; and this card's Type in wTempCardType
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	pop de
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+
+; loop the energy cards in the Discard Pile
+; and check if they are useful for this Pokemon
+	ld hl, wDuelTempList
+.loop_energy_cards_1
+	ld a, [hli]
+	cp $ff
+	jr z, .next_play_area
+
+	ld b, a
+	push hl
+	farcall CheckIfEnergyIsUseful
+	pop hl
+	jr nc, .loop_energy_cards_1
+
+	ld a, [wce1a]
+	cp $ff
+	jr nz, .second_energy_1
+
+; check if there were already chosen cards,
+; if this is the second chosen card, return carry
+
+; first energy card found
+	ld a, b
+	ld [wce1a], a
+	call RemoveCardFromList
+	jr .next_play_area
+.second_energy_1
+	ld a, b
+	ld [wce1b], a
+	jr .set_carry
+
+.next_play_area
+	inc e
+	dec d
+	jr nz, .loop_play_area
+
+; next, if there are still energy cards left to choose,
+; loop through the energy cards again and select
+; them in order.
+	ld hl, wDuelTempList
+.loop_energy_cards_2
+	ld a, [hli]
+	cp $ff
+	jr z, .check_chosen
+	ld b, a
+	ld a, [wce1a]
+	cp $ff
+	jr nz, .second_energy_2
+	ld a, b
+	ld [wce1a], a
+	call RemoveCardFromList
+	jr .loop_energy_cards_2
+
+.second_energy_2
+	ld a, b
+	ld [wce1b], a
+	jr .set_carry
+
+; will set carry if at least one has been chosen
+.check_chosen
+	ld a, [wce1a]
+	cp $ff
+	jr nz, .set_carry
+.no_carry
+	or a
+	ret
+
+.set_carry
+	ld a, [wce06]
+	scf
+	ret
+
+; remove an element from the list
+; and shortens it accordingly
+; input:
+;   hl = pointer to element after the one to remove
+RemoveCardFromList: ; 20f27 (8:4f27)
+	push de
+	ld d, h
+	ld e, l
+	dec hl
+	push hl
+.loop_remove
+	ld a, [de]
+	ld [hli], a
+	cp $ff
+	jr z, .done_remove
+	inc de
+	jr .loop_remove
+.done_remove
+	pop hl
+	pop de
+	ret
+
+; finds duplicates in card list in hl.
+; if a duplicate of Pokemon cards are found, return in
+; a the deck index of the second one.
+; otherwise, if a duplicate of non-Pokemon cards are found
+; return in a the deck index of the second one.
+; if no duplicates found, return carry.
+; input:
+;   hl = list to look in
+; output:
+;   a = deck index of duplicate card
+FindDuplicateCards: ; 20f38 (8:4f38)
+	ld a, $ff
+	ld [wce0f], a
+	ld [wce0f + 1], a
+	push hl
+
+.loop_outer
+; get ID of current card
+	pop hl
+	ld a, [hli]
+	cp $ff
+	jr z, .check_found
+	call GetCardIDFromDeckIndex
+	ld b, e
+	push hl
+
+; loop the rest of the list to find
+; another card with the same ID
+.loop_inner
+	ld a, [hli]
+	cp $ff
+	jr z, .loop_outer
+	ld c, a
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp b
+	jr nz, .loop_inner
+
+; found two cards with same ID
+	push bc
+	call GetCardType
+	pop bc
+	cp TYPE_ENERGY
+	jr c, .not_energy
+
+; they are energy or trainer cards
+; loads wce0f+1 with this card deck index
+	ld a, c
+	ld [wce0f + 1], a
+	jr .loop_outer
+
+.not_energy
+; they are Pokemon cards
+; loads wce0f with this card deck index
+	ld a, c
+	ld [wce0f], a
+	jr .loop_outer
+
+.check_found
+	ld a, [wce0f]
+	cp $ff
+	jr nz, .no_carry
+	ld a, [wce0f + 1]
+	cp $ff
+	jr nz, .no_carry
+
+; only set carry if duplicate cards were not found
+	scf
+	ret
+
+.no_carry
+; two cards with the same ID were found
+; of either Pokemon or Non-Pokemon cards
+	or a
+	ret
+
+AIPlay_SuperEnergyRetrieval: ; 20f80 (8:4f80)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wce1b]
+	ldh [hTempRetreatCostCards], a
+	ld a, [wce1c]
+	ldh [$ffa3], a
+	cp $ff
+	jr z, .asm_20fbb
+	ld a, [wce1d]
+	ldh [$ffa4], a
+	cp $ff
+	jr z, .asm_20fbb
+	ld a, [wce1e]
+	ldh [$ffa5], a
+	cp $ff
+	jr z, .asm_20fbb
+	ld a, $ff
+	ldh [$ffa6], a
+.asm_20fbb
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_SuperEnergyRetrieval: ; 20fc1 (8:4fc1)
+; return no carry if no cards in hand
+	farcall CreateEnergyCardListFromHand
+	jp nc, .no_carry
+
+; handle Go Go Rain Dance deck
+; return no carry if there's no Muk card in play and
+; if there's no Blastoise card in Play Area
+; if there's a Muk in play, continue as normal
+	ld a, [wOpponentDeckID]
+	cp GO_GO_RAIN_DANCE_DECK_ID
+	jr nz, .start
+	ld a, MUK
+	call CountPokemonIDInBothPlayAreas
+	jr c, .start
+	ld a, BLASTOISE
+	call CountPokemonIDInPlayArea
+	jp nc, .no_carry
+
+.start
+; find duplicate cards in hand
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	call FindDuplicateCards
+	jp c, .no_carry
+
+; remove the duplicate card in hand
+; and run the hand check again
+	ld [wce06], a
+	ld hl, wDuelTempList
+	call FindAndRemoveCardFromList
+	call FindDuplicateCards
+	jp c, .no_carry
+
+	ld [wce08], a
+	ld a, CARD_LOCATION_DISCARD_PILE
+	call FindBasicEnergyCardsInLocation
+	jp c, .no_carry
+
+; some basic energy cards were found in Discard Pile
+	ld a, $ff
+	ld [wce1b], a
+	ld [wce1c], a
+	ld [wce1d], a
+	ld [wce1e], a
+	ld [wce1f], a
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+; first check if there are useful energy cards in the list
+; and choose them for retrieval first
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+
+; load this card's ID in wTempCardID
+; and this card's Type in wTempCardType
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	pop de
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+
+; loop the energy cards in the Discard Pile
+; and check if they are useful for this Pokemon
+	ld hl, wDuelTempList
+.loop_energy_cards_1
+	ld a, [hli]
+	cp $ff
+	jr z, .next_play_area
+
+	ld b, a
+	push hl
+	farcall CheckIfEnergyIsUseful
+	pop hl
+	jr nc, .loop_energy_cards_1
+
+; first energy
+	ld a, [wce1b]
+	cp $ff
+	jr nz, .second_energy_1
+	ld a, b
+	ld [wce1b], a
+	call RemoveCardFromList
+	jr .next_play_area
+
+.second_energy_1
+	ld a, [wce1c]
+	cp $ff
+	jr nz, .third_energy_1
+	ld a, b
+	ld [wce1c], a
+	call RemoveCardFromList
+	jr .next_play_area
+
+.third_energy_1
+	ld a, [wce1d]
+	cp $ff
+	jr nz, .fourth_energy_1
+	ld a, b
+	ld [wce1d], a
+	call RemoveCardFromList
+	jr .next_play_area
+
+.fourth_energy_1
+	ld a, b
+	ld [wce1e], a
+	jr .set_carry
+
+.next_play_area
+	inc e
+	dec d
+	jr nz, .loop_play_area
+
+; next, if there are still energy cards left to choose,
+; loop through the energy cards again and select
+; them in order.
+	ld hl, wDuelTempList
+.loop_energy_cards_2
+	ld a, [hli]
+	cp $ff
+	jr z, .check_chosen
+	ld b, a
+	ld a, [wce1b]
+	cp $ff
+	jr nz, .second_energy_2
+	ld a, b
+
+; first energy
+	ld [wce1b], a
+	call RemoveCardFromList
+	jr .loop_energy_cards_2
+
+.second_energy_2
+	ld a, [wce1c]
+	cp $ff
+	jr nz, .third_energy_2
+	ld a, b
+	ld [wce1c], a
+	call RemoveCardFromList
+	jr .loop_energy_cards_2
+
+.third_energy_2
+	ld a, [wce1d]
+	cp $ff
+	jr nz, .fourth_energy
+	ld a, b
+	ld [wce1d], a
+	call RemoveCardFromList
+	jr .loop_energy_cards_2
+
+.fourth_energy
+	ld a, b
+	ld [wce1e], a
+	jr .set_carry
+
+; will set carry if at least one has been chosen
+.check_chosen
+	ld a, [wce1b]
+	cp $ff
+	jr nz, .set_carry
+
+.no_carry
+	or a
+	ret
+.set_carry
+	ld a, [wce08]
+	ld [wce1a], a
+	ld a, [wce06]
+	scf
+	ret
+
+; finds the card with deck index a in list hl,
+; and removes it from the list.
+; the card HAS to exist in the list, since this
+; routine does not check for the terminating byte $ff!
+; input:
+;   a  = card deck index to look
+;   hl = pointer to list of cards
+FindAndRemoveCardFromList: ; 210d5 (8:50d5)
+	push hl
+	ld b, a
+.loop_duplicate
+	ld a, [hli]
+	cp b
+	jr nz, .loop_duplicate
+	call RemoveCardFromList
+	pop hl
+	ret
+
+AIPlay_PokemonCenter: ; 210e0 (8:50e0)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_PokemonCenter: ; 210eb (8:50eb)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+; return if active Pokemon can KO player's card.
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .start
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry
+
+.start
+	xor a
+	ld [wce06], a
+	ld [wce08], a
+	ld [wce0f], a
+
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, e ; useless instruction
+	pop de
+
+; get this Pokemon's current HP in number of counters
+; and add it to the total.
+	ld a, [wLoadedCard1HP]
+	call ConvertHPToCounters
+	ld b, a
+	ld a, [wce06]
+	add b
+	ld [wce06], a
+
+; get this Pokemon's current damage counters
+; and add it to the total.
+	call GetCardDamageAndMaxHP
+	call ConvertHPToCounters
+	ld b, a
+	ld a, [wce08]
+	add b
+	ld [wce08], a
+
+; get this Pokemon's number of attached energy cards
+; and add it to the total.
+; if there's overflow, return no carry.
+	call GetPlayAreaCardAttachedEnergies
+	ld a, [wTotalAttachedEnergies]
+	ld b, a
+	ld a, [wce0f]
+	add b
+	jr c, .no_carry
+	ld [wce0f], a
+
+	inc e
+	dec d
+	jr nz, .loop_play_area
+
+; if (number of damage counters / 2) < (total energy cards attached)
+; return no carry.
+	ld a, [wce08]
+	srl a
+	ld hl, wce0f
+	cp [hl]
+	jr c, .no_carry
+
+; if (number of HP counters * 6 / 10) >= (number of damage counters)
+; return no carry.
+	ld a, [wce06]
+	ld l, a
+	ld h, 6
+	call HtimesL
+	call CalculateWordTensDigit
+	ld a, l
+	ld hl, wce08
+	cp [hl]
+	jr nc, .no_carry
+
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+AIPlay_ImposterProfessorOak: ; 21170 (8:5170)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; sets carry depending on player's number of cards
+; in deck in in hand.
+AIDecide_ImposterProfessorOak: ; 2117b (8:517b)
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetNonTurnDuelistVariable
+	cp DECK_SIZE - 14
+	jr c, .more_than_14_cards
+
+; if player has less than 14 cards in deck, only
+; set carry if number of cards in their hands < 6
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetNonTurnDuelistVariable
+	cp 6
+	jr c, .set_carry
+.no_carry
+	or a
+	ret
+
+; if player has more than 14 cards in deck, only
+; set carry if number of cards in their hands >= 9
+.more_than_14_cards
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetNonTurnDuelistVariable
+	cp 9
+	jr c, .no_carry
+.set_carry
+	scf
+	ret
+
+AIPlay_EnergySearch: ; 2119a (8:519a)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; AI checks for playing Energy Search
+AIDecide_EnergySearch: ; 211aa (8:51aa)
+	farcall CreateEnergyCardListFromHand
+	jr c, .start
+	call .CheckForUsefulEnergyCards
+	jr c, .start
+
+; there are energy cards in hand and at least
+; one of them is useful to a card in Play Area
+.no_carry
+	or a
+	ret
+
+.start
+	ld a, [wOpponentDeckID]
+	cp HEATED_BATTLE_DECK_ID
+	jr z, .heated_battle
+	cp WONDERS_OF_SCIENCE_DECK_ID
+	jr z, .wonders_of_science
+
+; if no energy cards in deck, return no carry
+	ld a, CARD_LOCATION_DECK
+	call FindBasicEnergyCardsInLocation
+	jr c, .no_carry
+
+; if any of the energy cards in deck is useful
+; return carry right away...
+	call .CheckForUsefulEnergyCards
+	jr c, .no_useful
+	scf
+	ret
+
+; ...otherwise save the list in a before return carry.
+.no_useful
+	ld a, [wDuelTempList]
+	scf
+	ret
+
+; Heated Battle deck only searches for Fire and Lightning
+; if they are found to be useful to some card in Play Area
+.heated_battle
+	ld a, CARD_LOCATION_DECK
+	call FindBasicEnergyCardsInLocation
+	jr c, .no_carry
+	call .CheckUsefulFireOrLightningEnergy
+	jr c, .no_carry
+	scf
+	ret
+
+; this subroutine has a bug.
+; it was supposed to use the .CheckUsefulGrassEnergy subroutine
+; but uses .CheckUsefulFireOrLightningEnergy instead.
+.wonders_of_science
+	ld a, CARD_LOCATION_DECK
+	call FindBasicEnergyCardsInLocation
+	jr c, .no_carry
+	call .CheckUsefulFireOrLightningEnergy
+	jr c, .no_carry
+	scf
+	ret
+
+; return carry if cards in wDuelTempList are not
+; useful to any of the Play Area Pokemon
+.CheckForUsefulEnergyCards ; 211f1 (8:51f1)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area_1
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+	call GetTurnDuelistVariable
+
+; store ID and type of card
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	pop de
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+	ld [wTempCardType], a
+
+; look in list for a useful energy,
+; is any is found return no carry.
+	ld hl, wDuelTempList
+.loop_energy_1
+	ld a, [hli]
+	cp $ff
+	jr z, .none_found
+	ld b, a
+	push hl
+	farcall CheckIfEnergyIsUseful
+	pop hl
+	jr nc, .loop_energy_1
+
+	ld a, b
+	or a
+	ret
+
+.none_found
+	inc e
+	ld a, e
+	cp d
+	jr nz, .loop_play_area_1
+
+	scf
+	ret
+
+; checks whether there are useful energies
+; only for Fire and Lightning type Pokemon cards
+; in Play Area. If none found, return carry.
+.CheckUsefulFireOrLightningEnergy ; 2122e (8:522e)
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area_2
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+	call GetTurnDuelistVariable
+
+; get card's ID and Type
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	pop de
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+
+; only do check if the Pokemon's type
+; is either Fire or Lightning
+	cp TYPE_ENERGY_FIRE
+	jr z, .fire_or_lightning
+	cp TYPE_ENERGY_LIGHTNING
+	jr nz, .next_play_area
+
+; loop each energy card in list
+.fire_or_lightning
+	ld [wTempCardType], a
+	ld hl, wDuelTempList
+.loop_energy_2
+	ld a, [hli]
+	cp $ff
+	jr z, .next_play_area
+
+; if this energy card is useful,
+; return no carry.
+	ld b, a
+	push hl
+	farcall CheckIfEnergyIsUseful
+	pop hl
+	jr nc, .loop_energy_2
+
+	ld a, b
+	or a
+	ret
+
+.next_play_area
+	inc e
+	ld a, e
+	cp d
+	jr nz, .loop_play_area_2
+
+; no card was found to be useful
+; for Fire/Lightning type Pokemon card.
+	scf
+	ret
+
+; checks whether there are useful energies
+; only for Grass type Pokemon cards
+; in Play Area. If none found, return carry.
+.CheckUsefulGrassEnergy ; 21273 (8:5273)
+; unreferenced
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	ld d, a
+	ld e, PLAY_AREA_ARENA
+
+.loop_play_area_3
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+	call GetTurnDuelistVariable
+
+; get card's ID and Type
+	call GetCardIDFromDeckIndex
+	ld a, e
+	ld [wTempCardID], a
+	call LoadCardDataToBuffer1_FromCardID
+	pop de
+	ld a, [wLoadedCard1Type]
+	or TYPE_ENERGY
+
+; only do check if the Pokemon's type is Grass
+	cp TYPE_ENERGY_GRASS
+	jr nz, .next_play_area_3
+
+; loop each energy card in list
+	ld [wTempCardType], a
+	ld hl, wDuelTempList
+.loop_energy_3
+	ld a, [hli]
+	cp $ff
+	jr z, .next_play_area_3
+
+; if this energy card is useful,
+; return no carry.
+	ld b, a
+	push hl
+	farcall CheckIfEnergyIsUseful
+	pop hl
+	jr nc, .loop_energy_3
+
+	ld a, b
+	or a
+	ret
+
+.next_play_area_3
+	inc e
+	ld a, e
+	cp d
+	jr nz, .loop_play_area_3
+
+; no card was found to be useful
+; for Grass type Pokemon card.
+	scf
+	ret
+
+AIPlay_Pokedex: ; 212b4 (8:52b4)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wce1a]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1b]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wce1c]
+	ldh [hTempRetreatCostCards], a
+	ld a, [wce1d]
+	ldh [$ffa3], a
+	ld a, [wce1e]
+	ldh [$ffa4], a
+	ld a, $ff
+	ldh [$ffa5], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_Pokedex: ; 212dc (8:52dc)
+	ld a, [wAIPokedexCounter]
+	cp 5 + 1
+	jr c, .no_carry ; return if counter hasn't reached 6 yet
+
+; return no carry if number of cards in deck <= 4
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 4
+	jr nc, .no_carry
+
+; has a 3 in 10 chance of actually playing card
+	ld a, 10
+	call Random
+	cp 3
+	jr c, .pick_cards
+
+.no_carry
+	or a
+	ret
+
+.pick_cards
+; the following comparison is disregarded
+; the Wonders of Science deck was probably intended
+; to use PickPokedexCards_Unreferenced instead
+	ld a, [wOpponentDeckID]
+	cp WONDERS_OF_SCIENCE_DECK_ID
+	jp PickPokedexCards ; bug, should be jp nz
+
+; picks order of the cards in deck from the effects of Pokedex.
+; prioritizes Pokemon cards, then Trainer cards, then energy cards.
+; stores the resulting order in wce1a.
+PickPokedexCards_Unreferenced: ; 212ff (8:52ff)
+; unreferenced
+	xor a
+	ld [wAIPokedexCounter], a ; reset counter
+
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	add DUELVARS_DECK_CARDS
+	ld l, a
+	lb de, $00, $00
+	ld b, 5
+
+; run through 5 of the remaining cards in deck
+.next_card
+	ld a, [hli]
+	ld c, a
+	call .GetCardType
+
+; load this card's deck index and type in memory
+; wce08 = card types
+; wce0f = card deck indices
+	push hl
+	ld hl, wce08
+	add hl, de
+	ld [hl], a
+	ld hl, wce0f
+	add hl, de
+	ld [hl], c
+	pop hl
+
+	inc e
+	dec b
+	jr nz, .next_card
+
+; terminate the wce08 list
+	ld a, $ff
+	ld [wce08 + 5], a
+
+	ld de, wce1a
+
+; find Pokemon
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+; run through the stored cards
+; and look for any Pokemon cards.
+.loop_pokemon
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .find_trainers
+	cp TYPE_ENERGY
+	jr nc, .loop_pokemon
+; found a Pokemon card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_pokemon
+
+; run through the stored cards
+; and look for any Trainer cards.
+.find_trainers
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+.loop_trainers
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .find_energy
+	cp TYPE_TRAINER
+	jr nz, .loop_trainers
+; found a Trainer card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_trainers
+
+.find_energy
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+; run through the stored cards
+; and look for any energy cards.
+.loop_energy
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+	and TYPE_ENERGY
+	jr z, .loop_energy
+; found an energy card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_energy
+
+.done
+	scf
+	ret
+
+.GetCardType ; 21383 (8:5383)
+	push bc
+	push de
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	pop de
+	pop bc
+	ret
+
+; picks order of the cards in deck from the effects of Pokedex.
+; prioritizes energy cards, then Pokemon cards, then Trainer cards.
+; stores the resulting order in wce1a.
+PickPokedexCards: ; 2138e (8:538e)
+	xor a
+	ld [wAIPokedexCounter], a ; reset counter ; reset counter
+
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	add DUELVARS_DECK_CARDS
+	ld l, a
+	lb de, $00, $00
+	ld b, 5
+
+; run through 5 of the remaining cards in deck
+.next_card
+	ld a, [hli]
+	ld c, a
+	call .GetCardType
+
+; load this card's deck index and type in memory
+; wce08 = card types
+; wce0f = card deck indices
+	push hl
+	ld hl, wce08
+	add hl, de
+	ld [hl], a
+	ld hl, wce0f
+	add hl, de
+	ld [hl], c
+	pop hl
+
+	inc e
+	dec b
+	jr nz, .next_card
+
+; terminate the wce08 list
+	ld a, $ff
+	ld [wce08 + 5], a
+
+	ld de, wce1a
+
+; find energy
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+; run through the stored cards
+; and look for any energy cards.
+.loop_energy
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .find_pokemon
+	and TYPE_ENERGY
+	jr z, .loop_energy
+; found an energy card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_energy
+
+.find_pokemon
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+; run through the stored cards
+; and look for any Pokemon cards.
+.loop_pokemon
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .find_trainers
+	cp TYPE_ENERGY
+	jr nc, .loop_pokemon
+; found a Pokemon card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_pokemon
+
+; run through the stored cards
+; and look for any Trainer cards.
+.find_trainers
+	ld hl, wce08
+	ld c, -1
+	ld b, $00
+
+.loop_trainers
+	inc c
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+	cp TYPE_TRAINER
+	jr nz, .loop_trainers
+; found a Trainer card
+; store it in wce1a list
+	push hl
+	ld hl, wce0f
+	add hl, bc
+	ld a, [hl]
+	pop hl
+	ld [de], a
+	inc de
+	jr .loop_trainers
+
+.done
+	scf
+	ret
+
+.GetCardType ; 21412 (8:5412)
+	push bc
+	push de
+	call GetCardIDFromDeckIndex
+	call GetCardType
+	pop de
+	pop bc
+	ret
+
+AIPlay_FullHeal: ; 2141d (8:541d)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_FullHeal: ; 21428 (8:5428)
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+
+; skip if no status on arena card
+	or a ; NO_STATUS
+	jr z, .no_carry
+
+	and CNF_SLP_PRZ
+	cp PARALYZED
+	jr z, .paralyzed
+	cp ASLEEP
+	jr z, .asleep
+	cp CONFUSED
+	jr z, .confused
+	; if either PSN or DBLPSN, fallthrough
+
+.set_carry
+	scf
+	ret
+
+.asleep
+; set carry if any of the following
+; cards are in the Play Area.
+	ld a, GASTLY1
+	ld b, PLAY_AREA_ARENA
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .set_carry
+	ld a, GASTLY2
+	ld b, PLAY_AREA_ARENA
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .set_carry
+	ld a, HAUNTER2
+	ld b, PLAY_AREA_ARENA
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .set_carry
+
+; otherwise fallthrough
+
+.paralyzed
+; if Scoop Up is in hand and decided to be played, skip.
+	ld a, SCOOP_UP
+	call LookForCardIDInHandList_Bank8
+	jr nc, .no_scoop_up_prz
+	call AIDecide_ScoopUp
+	jr c, .no_carry
+
+.no_scoop_up_prz
+; if card can damage defending Pokemon...
+	xor a ; PLAY_AREA_ARENA
+	farcall CheckIfCanDamageDefendingPokemon
+	jr nc, .no_carry
+; ...and can play an energy card to retreat, set carry.
+	ld a, [wAIPlayEnergyCardForRetreat]
+	or a
+	jr nz, .set_carry
+
+; if not, check whether it's a card it would rather retreat,
+; and if it isn't, set carry.
+	farcall AIDecideWhetherToRetreat
+	jr nc, .set_carry
+
+.no_carry
+	or a
+	ret
+
+.confused
+; if Scoop Up is in hand and decided to be played, skip.
+	ld a, SCOOP_UP
+	call LookForCardIDInHandList_Bank8
+	jr nc, .no_scoop_up_cnf
+	call AIDecide_ScoopUp
+	jr c, .no_carry
+
+.no_scoop_up_cnf
+; if card can damage defending Pokemon...
+	xor a ; PLAY_AREA_ARENA
+	farcall CheckIfCanDamageDefendingPokemon
+	jr nc, .no_carry
+; ...and can play an energy card to retreat, set carry.
+	ld a, [wAIPlayEnergyCardForRetreat]
+	or a
+	jr nz, .set_carry
+; if not, return no carry.
+	jr .no_carry
+
+AIPlay_MrFuji: ; 21497 (8:5497)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; AI logic for playing Mr Fuji
+AIDecide_MrFuji: ; 214a7 (8:54a7)
+	ld a, $ff
+	ld [wce06], a
+	ld [wce08], a
+
+; if just one Pokemon in Play Area, skip.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 1
+	ret z
+
+	dec a
+	ld d, a
+	ld e, PLAY_AREA_BENCH_1
+
+; find a Pokemon in the bench that has damage counters.
+.loop_bench
+	ld a, DUELVARS_ARENA_CARD
+	add e
+	push de
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	pop de
+
+	ld a, [wLoadedCard1HP]
+	ld b, a
+
+	; skip if zero damage counters
+	call GetCardDamageAndMaxHP
+	call ConvertHPToCounters
+	or a
+	jr z, .next
+
+; a = damage counters
+; b = hp left
+	call CalculateBDividedByA_Bank8
+	cp 20
+	jr nc, .next
+
+; here, HP left in counters is less than twice
+; the number of damage counters, that is:
+; HP < 1/3 max HP
+
+; if value is less than the one found before, store this one.
+	ld hl, wce08
+	cp [hl]
+	jr nc, .next
+	ld [hl], a
+	ld a, e
+	ld [wce06], a
+.next
+	inc e
+	dec d
+	jr nz, .loop_bench
+
+	ld a, [wce06]
+	cp $ff
+	ret z
+
+	scf
+	ret
+
+AIPlay_ScoopUp: ; 214f1 (8:54f1)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_ScoopUp: ; 21506 (8:5506)
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+
+; if only one Pokemon in Play Area, skip.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 2
+	jr c, .no_carry
+
+; handle some decks differently
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_ARTICUNO_DECK_ID
+	jr z, .HandleLegendaryArticuno
+	cp LEGENDARY_RONALD_DECK_ID
+	jp z, .HandleLegendaryRonald
+
+; if can't KO defending Pokemon, check if defending Pokemon
+; can KO this card. If so, then continue.
+; If not, return no carry.
+
+; if it can KO the defending Pokemon this turn,
+; return no carry.
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .cannot_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry
+
+.cannot_ko
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	cp PARALYZED
+	jr z, .cannot_retreat
+	cp ASLEEP
+	jr z, .cannot_retreat
+
+; doesn't have a status that prevents retreat.
+; so check if it has enough energy to retreat.
+; if not, return no carry.
+	xor a
+	ldh [hTempPlayAreaLocation_ff9d], a
+	call GetPlayAreaCardRetreatCost
+	ld b, a
+	ld e, PLAY_AREA_ARENA
+	farcall CountNumberOfEnergyCardsAttached
+	cp b
+	jr c, .cannot_retreat
+
+.no_carry
+	or a
+	ret
+
+.cannot_retreat
+; store damage and total HP left
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call LoadCardDataToBuffer1_FromDeckIndex
+	ld a, [wLoadedCard1HP]
+	call ConvertHPToCounters
+	ld d, a
+
+; skip if card has no damage counters.
+	ld e, PLAY_AREA_ARENA
+	call GetCardDamageAndMaxHP
+	or a
+	jr z, .no_carry
+
+; if (total damage / total HP counters) < 7
+; return carry.
+; (this corresponds to damage counters
+; being under 70% of the max HP)
+	ld b, a
+	ld a, d
+	call CalculateBDividedByA_Bank8
+	cp 7
+	jr c, .no_carry
+
+; store Pokemon to switch to in wce1a and set carry.
+.decide_switch
+	farcall AIDecideBenchPokemonToSwitchTo
+	jr c, .no_carry
+	ld [wce1a], a
+	xor a
+	scf
+	ret
+
+; this deck will use Scoop Up on a benched Articuno2.
+; it checks if the defending Pokemon is a Snorlax,
+; but interestingly does not check for Muk in both Play Areas.
+; will also use Scoop Up on
+.HandleLegendaryArticuno
+; if less than 3 Play Area Pokemon cards, skip.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 3
+	jr c, .no_carry
+
+; look for Articuno2 in bench
+	ld a, ARTICUNO2
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .articuno_bench
+
+; check Arena card
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp ARTICUNO2
+	jr z, .articuno_or_chansey
+	cp CHANSEY
+	jr nz, .no_carry
+
+; here either Articuno2 or Chansey
+; is the Arena Card.
+.articuno_or_chansey
+; if can't KO defending Pokemon, check if defending Pokemon
+; can KO this card. If so, then continue.
+; If not, return no carry.
+
+; if it can KO the defending Pokemon this turn,
+; return no carry.
+	farcall CheckIfAnyAttackKnocksOutDefendingCard
+	jr nc, .check_ko
+	farcall CheckIfSelectedAttackIsUnusable
+	jr nc, .no_carry
+	farcall LookForEnergyNeededForAttackInHand
+	jr c, .no_carry
+.check_ko
+	farcall CheckIfDefendingPokemonCanKnockOut
+	jr nc, .no_carry
+	jr .decide_switch
+
+.articuno_bench
+; skip if the defending card is Snorlax
+	push af
+	ld a, DUELVARS_ARENA_CARD
+	call GetNonTurnDuelistVariable
+	call SwapTurn
+	call GetCardIDFromDeckIndex
+	call SwapTurn
+	ld a, e
+	cp SNORLAX
+	pop bc
+	jr z, .no_carry
+
+; check attached energy cards.
+; if it has any, return no carry.
+	ld a, b
+.check_attached_energy
+	ld e, a
+	push af
+	farcall CountNumberOfEnergyCardsAttached
+	or a
+	pop bc
+	ld a, b
+	jr z, .no_energy
+	jp .no_carry
+
+.no_energy
+; has decided to Scoop Up benched card,
+; store $ff as the Pokemon card to switch to
+; because there's no need to switch.
+	push af
+	ld a, $ff
+	ld [wce1a], a
+	pop af
+	scf
+	ret
+
+; this deck will use Scoop Up on a benched Articuno2, Zapdos3 or Moltres2.
+; interestingly, does not check for Muk in both Play Areas.
+.HandleLegendaryRonald ; 215e7 (8:55e7)
+; if less than 3 Play Area Pokemon cards, skip.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 3
+	jp c, .no_carry
+
+	ld a, ARTICUNO2
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .articuno_bench
+	ld a, ZAPDOS3
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .check_attached_energy
+	ld a, MOLTRES2
+	ld b, PLAY_AREA_BENCH_1
+	call LookForCardIDInPlayArea_Bank8
+	jr c, .check_attached_energy
+	jp .no_carry
+
+AIPlay_Maintenance: ; 2160f (8:560f)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wce1a]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1b]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; AI logic for playing Maintenance
+AIDecide_Maintenance: ; 2162c (8:562c)
+; Imakuni? has his own thing
+	ld a, [wOpponentDeckID]
+	cp IMAKUNI_DECK_ID
+	jr z, .imakuni
+
+; skip if number of cars in hand < 4.
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 4
+	jr c, .no_carry
+
+; list out all the hand cards and remove
+; wAITrainerCardToPlay from list.Then find any duplicate cards.
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld a, [wAITrainerCardToPlay]
+	call FindAndRemoveCardFromList
+; if duplicates are not found, return no carry.
+	call FindDuplicateCards
+	jp c, .no_carry
+
+; store the first duplicate card and remove it from the list.
+; run duplicate check again.
+	ld [wce1a], a
+	ld hl, wDuelTempList
+	call FindAndRemoveCardFromList
+; if duplicates are not found, return no carry.
+	call FindDuplicateCards
+	jp c, .no_carry
+
+; store the second duplicate card and return carry.
+	ld [wce1b], a
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+.imakuni
+; has a 2 in 10 chance of not skipping.
+	ld a, 10
+	call Random
+	cp 2
+	jr nc, .no_carry
+
+; skip if number of cards in hand < 3.
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 3
+	jr c, .no_carry
+
+; shuffle hand cards
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	call CountCardsInDuelTempList
+	call ShuffleCards
+
+; go through each card and find
+; cards that are different from wAITrainerCardToPlay.
+; if found, add those cards to wce1a and wce1a+1.
+	ld a, [wAITrainerCardToPlay]
+	ld b, a
+	ld c, 2
+	ld de, wce1a
+
+.loop
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	cp b
+	jr z, .loop
+	ld [de], a
+	inc de
+	dec c
+	jr nz, .loop
+
+; two cards were found, return carry.
+	scf
+	ret
+
+AIPlay_Recycle: ; 2169a (8:569a)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ldtx de, TrainerCardSuccessCheckText
+	bank1call TossCoin
+	jr nc, .asm_216ae
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	jr .asm_216b2
+.asm_216ae
+	ld a, $ff
+	ldh [hTemp_ffa0], a
+.asm_216b2
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; lists cards to look for in the Discard Pile.
+; has priorities for Ghost Deck, and a "default" priority list
+; (which is the Fire Charge deck, since it's the only other
+; deck that runs a Recycle card in it.)
+AIDecide_Recycle: ; 216b8 (8:56b8)
+; no use checking if no cards in Discard Pile
+	call CreateDiscardPileCardList
+	jr c, .no_carry
+
+	ld a, $ff
+	ld [wce08], a
+	ld [wce08 + 1], a
+	ld [wce08 + 2], a
+	ld [wce08 + 3], a
+	ld [wce08 + 4], a
+
+; handle Ghost deck differently
+	ld hl, wDuelTempList
+	ld a, [wOpponentDeckID]
+	cp GHOST_DECK_ID
+	jr z, .loop_2
+
+; priority list for Fire Charge deck
+.loop_1
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+
+; double colorless
+	cp DOUBLE_COLORLESS_ENERGY
+	jr nz, .chansey
+	ld a, b
+	ld [wce08], a
+	jr .loop_1
+
+.chansey
+	cp CHANSEY
+	jr nz, .tauros
+	ld a, b
+	ld [wce08 + 1], a
+	jr .loop_1
+
+.tauros
+	cp TAUROS
+	jr nz, .jigglypuff
+	ld a, b
+	ld [wce08 + 2], a
+	jr .loop_1
+
+.jigglypuff
+	cp JIGGLYPUFF1
+	jr nz, .loop_1
+	ld a, b
+	ld [wce08 + 3], a
+	jr .loop_1
+
+; loop through wce08 and set carry
+; on the first that was found in Discard Pile.
+; if none were found, return no carry.
+.done
+	ld hl, wce08
+	ld b, 5
+.loop_found
+	ld a, [hli]
+	cp $ff
+	jr nz, .set_carry
+	dec b
+	jr nz, .loop_found
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+; priority list for Ghost deck
+.loop_2
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+
+; gastly2
+	cp GASTLY2
+	jr nz, .gastly1
+	ld a, b
+	ld [wce08], a
+	jr .loop_2
+
+.gastly1
+	cp GASTLY1
+	jr nz, .zubat
+	ld a, b
+	ld [wce08 + 1], a
+	jr .loop_2
+
+.zubat
+	cp ZUBAT
+	jr nz, .ditto
+	ld a, b
+	ld [wce08 + 2], a
+	jr .loop_2
+
+.ditto
+	cp DITTO
+	jr nz, .meowth
+	ld a, b
+	ld [wce08 + 3], a
+	jr .loop_2
+
+.meowth
+	cp MEOWTH2
+	jr nz, .loop_2
+	ld a, b
+	ld [wce08 + 4], a
+	jr .loop_2
+
+AIPlay_Lass: ; 21755 (8:5755)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_Lass: ; 21768 (8:5768)
+; skip if player has less than 7 cards in hand
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetNonTurnDuelistVariable
+	cp 7
+	jr c, .no_carry
+
+; look for Trainer cards in hand (except for Lass)
+; if any is found, return no carry.
+; otherwise, return carry.
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.loop
+	ld a, [hli]
+	cp $ff
+	jr z, .set_carry
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp LASS
+	jr z, .loop
+	ld a, [wLoadedCard1Type]
+	cp TYPE_TRAINER
+	jr nz, .loop
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIPlay_ItemFinder: ; 2178f (8:578f)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wce1a]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1b]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTempRetreatCostCards], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; checks whether there's Energy Removal in Discard Pile.
+; if so, find duplicate cards in hand to discard
+; that are not Mr Mime and Pokemon Trader cards.
+; this logic is suitable only for Strange Psyshock deck.
+AIDecide_ItemFinder: ; 217b1 (8:57b1)
+; skip if no Discard Pile.
+	call CreateDiscardPileCardList
+	jr c, .no_carry
+
+; look for Energy Removal in Discard Pile
+	ld hl, wDuelTempList
+.loop_discard_pile
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp ENERGY_REMOVAL
+	jr nz, .loop_discard_pile
+; found, store this deck index
+	ld a, b
+	ld [wce06], a
+
+; before looking for cards to discard in hand,
+; remove any Mr Mime and Pokemon Trader cards.
+; this way these are guaranteed to not be discarded.
+	call CreateHandCardList
+	ld hl, wDuelTempList
+.loop_hand
+	ld a, [hli]
+	cp $ff
+	jr z, .choose_discard
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+	cp MR_MIME
+	jr nz, .pkmn_trader
+	call RemoveCardFromList
+	jr .loop_hand
+.pkmn_trader
+	cp POKEMON_TRADER
+	jr nz, .loop_hand
+	call RemoveCardFromList
+	jr .loop_hand
+
+; choose cards to discard from hand.
+.choose_discard
+	ld hl, wDuelTempList
+
+; do not discard wAITrainerCardToPlay
+	ld a, [wAITrainerCardToPlay]
+	call FindAndRemoveCardFromList
+; find any duplicates, if not found, return no carry.
+	call FindDuplicateCards
+	jp c, .no_carry
+
+; store the duplicate found in wce1a and
+; remove it from the hand list.
+	ld [wce1a], a
+	ld hl, wDuelTempList
+	call FindAndRemoveCardFromList
+; find duplicates again, if not found, return no carry.
+	call FindDuplicateCards
+	jp c, .no_carry
+
+; store the duplicate found in wce1b.
+; output the card to be recovered from the Discard Pile.
+	ld [wce1b], a
+	ld a, [wce06]
+	scf
+	ret
+
+.no_carry
+	or a
+	ret
+
+AIPlay_Imakuni: ; 21813 (8:5813)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; only sets carry if Active card is not confused.
+AIDecide_Imakuni: ; 2181e (8:581e)
+	ld a, DUELVARS_ARENA_CARD_STATUS
+	call GetTurnDuelistVariable
+	and CNF_SLP_PRZ
+	cp CONFUSED
+	jr z, .confused
+	scf
+	ret
+.confused
+	or a
+	ret
+
+AIPlay_Gambler: ; 2182d (8:582d)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wOpponentDeckID]
+	cp IMAKUNI_DECK_ID
+	jr z, .asm_2186a
+	ld hl, wRNG1
+	ld a, [hli]
+	ld [wce06], a
+	ld a, [hli]
+	ld [wce08], a
+	ld a, [hl]
+	ld [wce0f], a
+	ld a, $50
+	ld [hld], a
+	ld [hld], a
+	ld [hl], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ld hl, wRNG1
+	ld a, [wce06]
+	ld [hli], a
+	ld a, [wce08]
+	ld [hli], a
+	ld a, [wce0f]
+	ld [hl], a
+	ret
+.asm_2186a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; checks whether to play Gambler.
+; aside from Imakuni?, all other opponents only
+; play this card if Player is running Mewtwo1-only deck.
+AIDecide_Gambler: ; 21875 (8:5875)
+; Imakuni? has his own routine
+	ld a, [wOpponentDeckID]
+	cp IMAKUNI_DECK_ID
+	jr z, .imakuni
+
+; check if flag is set for Player using Mewtwo1 only deck
+	ld a, [wAIBarrierFlagCounter]
+	and AI_MEWTWO_MILL
+	jr z, .no_carry
+
+; set carry if number of cards in deck <= 4.
+; this is done to counteract the deck out strategy
+; of Mewtwo1 deck, by replenishing the deck with hand cards.
+	ld a, DUELVARS_NUMBER_OF_CARDS_NOT_IN_DECK
+	call GetTurnDuelistVariable
+	cp DECK_SIZE - 4
+	jr nc, .set_carry
+.no_carry
+	or a
+	ret
+
+.imakuni
+; has a 2 in 10 chance of returning carry
+	ld a, 10
+	call Random
+	cp 2
+	jr nc, .no_carry
+.set_carry
+	scf
+	ret
+
+AIPlay_Revive: ; 21899 (8:5899)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; checks certain cards in Discard Pile to use Revive on.
+; suitable for Muscle For Brains deck only.
+AIDecide_Revive: ; 218a9 (8:58a9)
+; skip if no cards in Discard Pile
+	call CreateDiscardPileCardList
+	jr c, .no_carry
+
+; skip if number of Pokemon cards in Play Area >= 4
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp 4
+	jr nc, .no_carry
+
+; look in Discard Pile for specific cards.
+	ld hl, wDuelTempList
+.loop_discard_pile
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	ld b, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+
+; these checks have a bug.
+; it works fine for Hitmonchan and Hitmonlee,
+; but in case it's a Tauros card, the routine will fallthrough
+; into the Kangaskhan check. since it will never be equal to Kangaskhan,
+; it will fallthrough into the set carry branch.
+; in case it's a Kangaskhan card, the check will fail in the Tauros check
+; and jump back into the loop. so just by accident the Tauros check works,
+; but Kangaskhan will never be correctly checked because of this.
+	cp HITMONCHAN
+	jr z, .set_carry
+	cp HITMONLEE
+	jr z, .set_carry
+	cp TAUROS
+	jr nz, .loop_discard_pile ; bug, these two lines should be swapped
+	cp KANGASKHAN
+	jr z, .set_carry ; bug, these two lines should be swapped
+
+.set_carry
+	ld a, b
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+AIPlay_PokemonFlute: ; 218d8 (8:58d8)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_PokemonFlute: ; 218e8 (8:58e8)
+; if player has no Discard Pile, skip.
+	call SwapTurn
+	call CreateDiscardPileCardList
+	call SwapTurn
+	jr c, .no_carry
+
+; if player's Play Area is already full, skip.
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetNonTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .no_carry
+
+	ld a, [wOpponentDeckID]
+	cp IMAKUNI_DECK_ID
+	jr z, .imakuni
+
+	ld a, $ff
+	ld [wce06], a
+	ld [wce08], a
+
+; find Basic stage Pokemon with lowest HP in Discard Pile
+	ld hl, wDuelTempList
+.loop_1
+	ld a, [hli]
+	cp $ff
+	jr z, .done
+
+	ld b, a
+	call SwapTurn
+	call LoadCardDataToBuffer1_FromDeckIndex
+	call SwapTurn
+; skip this card if it's not Pokemon card
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr nc, .loop_1
+; skip this card if it's not Basic Stage
+	ld a, [wLoadedCard1Stage]
+	or a ; BASIC
+	jr nz, .loop_1
+
+; compare this HP with one stored
+	ld a, [wLoadedCard1HP]
+	push hl
+	ld hl, wce06
+	cp [hl]
+	pop hl
+	jr nc, .loop_1
+; if lower, store this one
+	ld [wce06], a
+	ld a, b
+	ld [wce08], a
+	jr .loop_1
+
+.done
+; if lowest HP found >= 50, return no carry
+	ld a, [wce06]
+	cp 50
+	jr nc, .no_carry
+; otherwise output its deck index in a and set carry.
+	ld a, [wce08]
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+.imakuni
+; has 2 in 10 chance of not skipping
+	ld a, 10
+	call Random
+	cp 2
+	jr nc, .no_carry
+
+; look for any Basic Pokemon card
+	ld hl, wDuelTempList
+.loop_2
+	ld a, [hli]
+	cp $ff
+	jr z, .no_carry
+	ld b, a
+	call SwapTurn
+	call LoadCardDataToBuffer1_FromDeckIndex
+	call SwapTurn
+	ld a, [wLoadedCard1Type]
+	cp TYPE_ENERGY
+	jr nc, .loop_2
+	ld a, [wLoadedCard1Stage]
+	or a ; BASIC
+	jr nz, .loop_2
+
+; a Basic stage Pokemon was found, return carry
+	ld a, b
+	scf
+	ret
+
+AIPlay_ClefairyDollOrMysteriousFossil: ; 21977 (8:5977)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; AI logic for playing Clefairy Doll
+AIDecide_ClefairyDollOrMysteriousFossil: ; 21982 (8:5982)
+; if has max number of Play Area Pokemon, skip
+	ld a, DUELVARS_NUMBER_OF_POKEMON_IN_PLAY_AREA
+	call GetTurnDuelistVariable
+	cp MAX_PLAY_AREA_POKEMON
+	jr nc, .no_carry
+
+; store number of Play Area Pokemon cards
+	ld [wce06], a
+
+; if the Arena card is Wigglytuff, return carry
+	ld a, DUELVARS_ARENA_CARD
+	call GetTurnDuelistVariable
+	call GetCardIDFromDeckIndex
+	ld a, e
+	cp WIGGLYTUFF
+	jr z, .set_carry
+
+; if number of Play Area Pokemon >= 4, return no carry
+	ld a, [wce06]
+	cp 4
+	jr nc, .no_carry
+
+.set_carry
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+AIPlay_Pokeball: ; 219a6 (8:59a6)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ldtx de, TrainerCardSuccessCheckText
+	bank1call TossCoin
+	ldh [hTemp_ffa0], a
+	jr nc, .asm_219bc
+	ld a, [wAITrainerCardParameter]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	jr .asm_219c0
+.asm_219bc
+	ld a, $ff
+	ldh [hTempPlayAreaLocation_ffa1], a
+.asm_219c0
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_Pokeball: ; 219c6 (8:59c6)
+; go to the routines associated with deck ID
+	ld a, [wOpponentDeckID]
+	cp FIRE_CHARGE_DECK_ID
+	jr z, .fire_charge
+	cp HARD_POKEMON_DECK_ID
+	jr z, .hard_pokemon
+	cp PIKACHU_DECK_ID
+	jr z, .pikachu
+	cp ETCETERA_DECK_ID
+	jr z, .etcetera
+	cp LOVELY_NIDORAN_DECK_ID
+	jp z, .lovely_nidoran
+	or a
+	ret
+
+; this deck runs a deck check for specific
+; card IDs in order of decreasing priority
+.fire_charge
+	ld e, CHANSEY
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, TAUROS
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, JIGGLYPUFF1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ret
+
+; this deck runs a deck check for specific
+; card IDs in order of decreasing priority
+.hard_pokemon
+	ld e, RHYHORN
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, RHYDON
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, ONIX
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ret
+
+; this deck runs a deck check for specific
+; card IDs in order of decreasing priority
+.pikachu
+	ld e, PIKACHU2
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, PIKACHU3
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, PIKACHU4
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, PIKACHU1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, FLYING_PIKACHU
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ret
+
+; this deck runs a deck check for specific
+; card IDs in order of decreasing priority
+; given a specific energy card in hand.
+; also it avoids redundancy, so if it already
+; has that card ID in the hand, it is skipped.
+.etcetera
+; fire
+	ld a, FIRE_ENERGY
+	call LookForCardIDInHandList_Bank8
+	jr nc, .lightning
+	ld a, CHARMANDER
+	call LookForCardIDInHandList_Bank8
+	jr c, .lightning
+	ld a, MAGMAR2
+	call LookForCardIDInHandList_Bank8
+	jr c, .lightning
+	ld e, CHARMANDER
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, MAGMAR2
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+
+.lightning
+	ld a, LIGHTNING_ENERGY
+	call LookForCardIDInHandList_Bank8
+	jr nc, .fighting
+	ld a, PIKACHU1
+	call LookForCardIDInHandList_Bank8
+	jr c, .fighting
+	ld a, MAGNEMITE1
+	call LookForCardIDInHandList_Bank8
+	jr c, .fighting
+	ld e, PIKACHU1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, MAGNEMITE1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+
+.fighting
+	ld a, FIGHTING_ENERGY
+	call LookForCardIDInHandList_Bank8
+	jr nc, .psychic
+	ld a, DIGLETT
+	call LookForCardIDInHandList_Bank8
+	jr c, .psychic
+	ld a, MACHOP
+	call LookForCardIDInHandList_Bank8
+	jr c, .psychic
+	ld e, DIGLETT
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, MACHOP
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+
+.psychic
+	ld a, PSYCHIC_ENERGY
+	call LookForCardIDInHandList_Bank8
+	jr nc, .done_etcetera
+	ld a, GASTLY1
+	call LookForCardIDInHandList_Bank8
+	jr c, .done_etcetera
+	ld a, JYNX
+	call LookForCardIDInHandList_Bank8
+	jr c, .done_etcetera
+	ld e, GASTLY1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+	ld e, JYNX
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	ret c
+.done_etcetera
+	or a
+	ret
+
+; this deck looks for card evolutions if
+; its pre-evolution is in hand or in Play Area.
+; if none of these are found, it looks for pre-evolutions
+; of cards it has in hand.
+; it does this for both the NidoranM (first)
+; and NidoranF (second) families.
+.lovely_nidoran
+	ld b, NIDORANM
+	ld a, NIDORINO
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	ret c
+	ld b, NIDORINO
+	ld a, NIDOKING
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	ret c
+	ld a, NIDORANM
+	ld b, NIDORINO
+	call LookForCardIDInDeck_GivenCardIDInHand
+	ret c
+	ld a, NIDORINO
+	ld b, NIDOKING
+	call LookForCardIDInDeck_GivenCardIDInHand
+	ret c
+	ld b, NIDORANF
+	ld a, NIDORINA
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	ret c
+	ld b, NIDORINA
+	ld a, NIDOQUEEN
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	ret c
+	ld a, NIDORANF
+	ld b, NIDORINA
+	call LookForCardIDInDeck_GivenCardIDInHand
+	ret c
+	ld a, NIDORINA
+	ld b, NIDOQUEEN
+	call LookForCardIDInDeck_GivenCardIDInHand
+	ret c
+	ret
+
+AIPlay_ComputerSearch: ; 21b12 (8:5b12)
+	ld a, [wCurrentAIFlags]
+	or AI_FLAG_MODIFIED_HAND
+	ld [wCurrentAIFlags], a
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTempRetreatCostCards], a
+	ld a, [wce1a]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1b]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+; checks what Deck ID AI is playing and handle
+; them in their own routine.
+AIDecide_ComputerSearch: ; 21b34 (8:5b34)
+; skip if number of cards in hand < 3
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 3
+	jr c, .no_carry
+
+	ld a, [wOpponentDeckID]
+	cp ROCK_CRUSHER_DECK_ID
+	jr z, AIDecide_ComputerSearch_RockCrusher
+	cp WONDERS_OF_SCIENCE_DECK_ID
+	jp z, AIDecide_ComputerSearch_WondersOfScience
+	cp FIRE_CHARGE_DECK_ID
+	jp z, AIDecide_ComputerSearch_FireCharge
+	cp ANGER_DECK_ID
+	jp z, AIDecide_ComputerSearch_Anger
+
+.no_carry
+	or a
+	ret
+
+AIDecide_ComputerSearch_RockCrusher: ; 21b55 (8:5b55)
+; if number of cards in hand is equal to 3,
+; target Professor Oak in deck
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 3
+	jr nz, .graveler
+
+	ld e, PROFESSOR_OAK
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr c, .find_discard_cards_1
+	; no Professor Oak in deck, fallthrough
+
+.no_carry
+	or a
+	ret
+
+.find_discard_cards_1
+	ld [wce06], a
+	ld a, $ff
+	ld [wce1a], a
+	ld [wce1b], a
+
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld de, wce1a
+.loop_hand_1
+	ld a, [hli]
+	cp $ff
+	jr z, .check_discard_cards
+
+	ld c, a
+	call LoadCardDataToBuffer1_FromDeckIndex
+
+; if any of the following cards are in the hand,
+; return no carry.
+	cp PROFESSOR_OAK
+	jr z, .no_carry
+	cp FIGHTING_ENERGY
+	jr z, .no_carry
+	cp DOUBLE_COLORLESS_ENERGY
+	jr z, .no_carry
+	cp DIGLETT
+	jr z, .no_carry
+	cp GEODUDE
+	jr z, .no_carry
+	cp ONIX
+	jr z, .no_carry
+	cp RHYHORN
+	jr z, .no_carry
+
+; if it's same as wAITrainerCardToPlay, skip this card.
+	ld a, [wAITrainerCardToPlay]
+	ld b, a
+	ld a, c
+	cp b
+	jr z, .loop_hand_1
+
+; store this card index in memory
+	ld [de], a
+	inc de
+	jr .loop_hand_1
+
+.check_discard_cards
+; check if two cards were found
+; if so, output in a the deck index
+; of Professor Oak card found in deck and set carry.
+	ld a, [wce1b]
+	cp $ff
+	jr z, .no_carry
+	ld a, [wce06]
+	scf
+	ret
+
+; more than 3 cards in hand, so look for
+; specific evolution cards.
+
+; checks if there is a Graveler card in the deck to target.
+; if so, check if there's Geodude in hand or Play Area,
+; and if there's no Graveler card in hand, proceed.
+; also removes Geodude from hand list so that it is not discarded.
+.graveler
+	ld e, GRAVELER
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .golem
+	ld [wce06], a
+	ld a, GEODUDE
+	call LookForCardIDInHandAndPlayArea
+	jr nc, .golem
+	ld a, GRAVELER
+	call LookForCardIDInHandList_Bank8
+	jr c, .golem
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld e, GEODUDE
+	farcall RemoveCardIDInList
+	jr .find_discard_cards_2
+
+; checks if there is a Golem card in the deck to target.
+; if so, check if there's Graveler in Play Area,
+; and if there's no Golem card in hand, proceed.
+.golem
+	ld e, GOLEM
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .dugtrio
+	ld [wce06], a
+	ld a, GRAVELER
+	call LookForCardIDInPlayArea_Bank8
+	jr nc, .dugtrio
+	ld a, GOLEM
+	call LookForCardIDInHandList_Bank8
+	jr c, .dugtrio
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	jr .find_discard_cards_2
+
+; checks if there is a Dugtrio card in the deck to target.
+; if so, check if there's Diglett in Play Area,
+; and if there's no Dugtrio card in hand, proceed.
+.dugtrio
+	ld e, DUGTRIO
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry
+	ld [wce06], a
+	ld a, DIGLETT
+	call LookForCardIDInPlayArea_Bank8
+	jp nc, .no_carry
+	ld a, DUGTRIO
+	call LookForCardIDInHandList_Bank8
+	jp c, .no_carry
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	jr .find_discard_cards_2
+
+.find_discard_cards_2
+	ld a, $ff
+	ld [wce1a], a
+	ld [wce1b], a
+
+	ld bc, wce1a
+	ld d, $00 ; start considering Trainer cards only
+
+; stores wAITrainerCardToPlay in e so that
+; all routines ignore it for the discard effects.
+	ld a, [wAITrainerCardToPlay]
+	ld e, a
+
+; this loop will store in wce1a cards to discard from hand.
+; at the start it will only consider Trainer cards,
+; then if there are still needed to discard,
+; move on to Pokemon cards, and finally to Energy cards.
+.loop_hand_2
+	call RemoveFromListDifferentCardOfGivenType
+	jr c, .found
+	inc d ; move on to next type (Pokemon, then Energy)
+	ld a, $03
+	cp d
+	jp z, .no_carry ; no more types to look
+	jr .loop_hand_2
+.found
+; store this card in memory,
+; and if there's still one more card to search for,
+; jump back into the loop.
+	ld [bc], a
+	inc bc
+	ld a, [wce1b]
+	cp $ff
+	jr z, .loop_hand_2
+
+; output in a Computer Search target and set carry.
+	ld a, [wce06]
+	scf
+	ret
+
+AIDecide_ComputerSearch_WondersOfScience: ; 21c56 (8:5c56)
+; if number of cards in hand < 5, target Professor Oak in deck
+	ld a, DUELVARS_NUMBER_OF_CARDS_IN_HAND
+	call GetTurnDuelistVariable
+	cp 5
+	jr nc, .look_in_hand
+
+; target Professor Oak for Computer Search
+	ld e, PROFESSOR_OAK
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .look_in_hand ; can be a jr
+	ld [wce06], a
+	jr .find_discard_cards
+
+; Professor Oak not in deck, move on to
+; look for other cards instead.
+; if Grimer or Muk are not in hand,
+; check whether to use Computer Search on them.
+.look_in_hand
+	ld a, GRIMER
+	call LookForCardIDInHandList_Bank8
+	jr nc, .target_grimer
+	ld a, MUK
+	call LookForCardIDInHandList_Bank8
+	jr nc, .target_muk
+
+.no_carry
+	or a
+	ret
+
+; first check Grimer
+; if in deck, check cards to discard.
+.target_grimer
+	ld e, GRIMER
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry ; can be a jr
+	ld [wce06], a
+	jr .find_discard_cards
+
+; first check Muk
+; if in deck, check cards to discard.
+.target_muk
+	ld e, MUK
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry ; can be a jr
+	ld [wce06], a
+
+; only discard Trainer cards from hand.
+; if there are less than 2 Trainer cards to discard,
+; then return with no carry.
+; else, store the cards to discard and the
+; target card deck index, and return carry.
+.find_discard_cards
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld d, $00 ; first consider Trainer cards
+
+; ignore wAITrainerCardToPlay for the discard effects.
+	ld a, [wAITrainerCardToPlay]
+	ld e, a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1a], a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1b], a
+	ld a, [wce06]
+	scf
+	ret
+
+AIDecide_ComputerSearch_FireCharge: ; 21cbb (8:5cbb)
+; pick target card in deck from highest to lowest priority.
+; if not found in hand, go to corresponding branch.
+	ld a, CHANSEY
+	call LookForCardIDInHandList_Bank8
+	jr nc, .chansey
+	ld a, TAUROS
+	call LookForCardIDInHandList_Bank8
+	jr nc, .tauros
+	ld a, JIGGLYPUFF1
+	call LookForCardIDInHandList_Bank8
+	jr nc, .jigglypuff
+	; fallthrough
+
+.no_carry
+	or a
+	ret
+
+; for each card targeted, check if it's in deck and,
+; if not, then return no carry.
+; else, look for cards to discard.
+.chansey
+	ld e, CHANSEY
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry
+	ld [wce06], a
+	jr .find_discard_cards
+.tauros
+	ld e, TAUROS
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry
+	ld [wce06], a
+	jr .find_discard_cards
+.jigglypuff
+	ld e, JIGGLYPUFF1
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jp nc, .no_carry
+	ld [wce06], a
+
+; only discard Trainer cards from hand.
+; if there are less than 2 Trainer cards to discard,
+; then return with no carry.
+; else, store the cards to discard and the
+; target card deck index, and return carry.
+.find_discard_cards
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld d, $00 ; first consider Trainer cards
+
+; ignore wAITrainerCardToPlay for the discard effects.
+	ld a, [wAITrainerCardToPlay]
+	ld e, a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1a], a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1b], a
+	ld a, [wce06]
+	scf
+	ret
+
+AIDecide_ComputerSearch_Anger: ; 21d1e (8:5d1e)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, RATTATA
+	ld a, RATICATE
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_discard_cards
+	ld a, RATTATA
+	ld b, RATICATE
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_discard_cards
+	ld b, GROWLITHE
+	ld a, ARCANINE1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_discard_cards
+	ld a, GROWLITHE
+	ld b, ARCANINE1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_discard_cards
+	ld b, DODUO
+	ld a, DODRIO
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_discard_cards
+	ld a, DODUO
+	ld b, DODRIO
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_discard_cards
+	; fallthrough
+
+.no_carry
+	or a
+	ret
+
+; only discard Trainer cards from hand.
+; if there are less than 2 Trainer cards to discard,
+; then return with no carry.
+; else, store the cards to discard and the
+; target card deck index, and return carry.
+.find_discard_cards
+	ld [wce06], a
+	call CreateHandCardList
+	ld hl, wDuelTempList
+	ld d, $00 ; first consider Trainer cards
+
+; ignore wAITrainerCardToPlay for the discard effects.
+	ld a, [wAITrainerCardToPlay]
+	ld e, a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1a], a
+	call RemoveFromListDifferentCardOfGivenType
+	jr nc, .no_carry
+	ld [wce1b], a
+	ld a, [wce06]
+	scf
+	ret
+
+AIPlay_PokemonTrader: ; 21d7a (8:5d7a)
+	ld a, [wAITrainerCardToPlay]
+	ldh [hTempCardIndex_ff9f], a
+	ld a, [wAITrainerCardParameter]
+	ldh [hTemp_ffa0], a
+	ld a, [wce1a]
+	ldh [hTempPlayAreaLocation_ffa1], a
+	ld a, OPPACTION_EXECUTE_TRAINER_EFFECTS
+	bank1call AIMakeDecision
+	ret
+
+AIDecide_PokemonTrader: ; 21d8f (8:5d8f)
+; each deck has their own routine for picking
+; what Pokemon to look for.
+	ld a, [wOpponentDeckID]
+	cp LEGENDARY_MOLTRES_DECK_ID
+	jr z, AIDecide_PokemonTrader_LegendaryMoltres
+	cp LEGENDARY_ARTICUNO_DECK_ID
+	jr z, AIDecide_PokemonTrader_LegendaryArticuno
+	cp LEGENDARY_DRAGONITE_DECK_ID
+	jp z, AIDecide_PokemonTrader_LegendaryDragonite
+	cp LEGENDARY_RONALD_DECK_ID
+	jp z, AIDecide_PokemonTrader_LegendaryRonald
+	cp BLISTERING_POKEMON_DECK_ID
+	jp z, AIDecide_PokemonTrader_BlisteringPokemon
+	cp SOUND_OF_THE_WAVES_DECK_ID
+	jp z, AIDecide_PokemonTrader_SoundOfTheWaves
+	cp POWER_GENERATOR_DECK_ID
+	jp z, AIDecide_PokemonTrader_PowerGenerator
+	cp FLOWER_GARDEN_DECK_ID
+	jp z, AIDecide_PokemonTrader_FlowerGarden
+	cp STRANGE_POWER_DECK_ID
+	jp z, AIDecide_PokemonTrader_StrangePower
+	cp FLAMETHROWER_DECK_ID
+	jp z, AIDecide_PokemonTrader_Flamethrower
+	or a
+	ret
+
+AIDecide_PokemonTrader_LegendaryMoltres: ; 21dc4 (8:5dc4)
+; look for Moltres2 card in deck to trade with a
+; card in hand different from Moltres1.
+	ld a, MOLTRES2
+	ld e, MOLTRES1
+	call LookForCardIDToTradeWithDifferentHandCard
+	jr nc, .no_carry
+; success
+	ld [wce1a], a
+	ld a, e
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+AIDecide_PokemonTrader_LegendaryArticuno: ; 21dd5 (8:5dd5)
+; if has none of these cards in Hand or Play Area, proceed
+	ld a, ARTICUNO1
+	call LookForCardIDInHandAndPlayArea
+	jr c, .no_carry
+	ld a, LAPRAS
+	call LookForCardIDInHandAndPlayArea
+	jr c, .no_carry
+
+; if doesn't have Seel in Hand or Play Area,
+; look for it in the deck.
+; otherwise, look for Dewgong instead.
+	ld a, SEEL
+	call LookForCardIDInHandAndPlayArea
+	jr c, .dewgong
+
+	ld e, SEEL
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .dewgong
+	ld [wce1a], a
+	jr .check_hand
+
+.dewgong
+	ld a, DEWGONG
+	call LookForCardIDInHandAndPlayArea
+	jr c, .no_carry
+	ld e, DEWGONG
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .no_carry
+	ld [wce1a], a
+
+; a Seel or Dewgong was found in deck,
+; check hand for card to trade for
+.check_hand
+	ld a, CHANSEY
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, DITTO
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, ARTICUNO2
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	; doesn't have any of the cards in hand
+
+.no_carry
+	or a
+	ret
+
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_LegendaryDragonite: ; 21e24 (8:5e24)
+; if has less than 5 cards of energy
+; and of Pokemon in hand/Play Area,
+; target a Kangaskhan in deck.
+	farcall CountOppEnergyCardsInHandAndAttached
+	cp 5
+	jr c, .kangaskhan
+	call CountPokemonCardsInHandAndInPlayArea
+	cp 5
+	jr c, .kangaskhan
+	; total number of energy cards >= 5
+	; total number of Pokemon cards >= 5
+
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, MAGIKARP
+	ld a, GYARADOS
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, MAGIKARP
+	ld b, GYARADOS
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, DRATINI
+	ld a, DRAGONAIR
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld b, DRAGONAIR
+	ld a, DRAGONITE1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, DRATINI
+	ld b, DRAGONAIR
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld a, DRAGONAIR
+	ld b, DRAGONITE1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, CHARMANDER
+	ld a, CHARMELEON
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld b, CHARMELEON
+	ld a, CHARIZARD
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, CHARMANDER
+	ld b, CHARMELEON
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld a, CHARMELEON
+	ld b, CHARIZARD
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	jr .no_carry
+
+.kangaskhan
+	ld e, KANGASKHAN
+	ld a, CARD_LOCATION_DECK
+	call LookForCardIDInLocation
+	jr nc, .no_carry
+
+; card was found as target in deck,
+; look for card in hand to trade with
+.choose_hand
+	ld [wce1a], a
+	ld a, DRAGONAIR
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, CHARMELEON
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, GYARADOS
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, MAGIKARP
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, CHARMANDER
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, DRATINI
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	; non found
+
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_LegendaryRonald: ; 21ec9 (8:5ec9)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, EEVEE
+	ld a, FLAREON1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld b, EEVEE
+	ld a, VAPOREON1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld b, EEVEE
+	ld a, JOLTEON1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, EEVEE
+	ld b, FLAREON1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld a, EEVEE
+	ld b, VAPOREON1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld a, EEVEE
+	ld b, JOLTEON1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, DRATINI
+	ld a, DRAGONAIR
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld b, DRAGONAIR
+	ld a, DRAGONITE1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, DRATINI
+	ld b, DRAGONAIR
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld a, DRAGONAIR
+	ld b, DRAGONITE1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	jr .no_carry
+
+; card was found as target in deck,
+; look for card in hand to trade with
+.choose_hand
+	ld [wce1a], a
+	ld a, ZAPDOS3
+	call LookForCardIDInHandList_Bank8
+	jr c, .set_carry
+	ld a, ARTICUNO2
+	call LookForCardIDInHandList_Bank8
+	jr c, .set_carry
+	ld a, MOLTRES2
+	call LookForCardIDInHandList_Bank8
+	jr c, .set_carry
+	; none found
+
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_BlisteringPokemon: ; 21f41 (8:5f41)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, RHYHORN
+	ld a, RHYDON
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, RHYHORN
+	ld b, RHYDON
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, CUBONE
+	ld a, MAROWAK1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, CUBONE
+	ld b, MAROWAK1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, PONYTA
+	ld a, RAPIDASH
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, PONYTA
+	ld b, RAPIDASH
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	jr .no_carry
+
+; a card in deck was found to look for,
+; check if there are duplicates in hand to trade with.
+.find_duplicates
+	ld [wce1a], a
+	call FindDuplicatePokemonCards
+	jr c, .set_carry
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_SoundOfTheWaves: ; 21f85 (8:5f85)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, SEEL
+	ld a, DEWGONG
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, SEEL
+	ld b, DEWGONG
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, KRABBY
+	ld a, KINGLER
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, KRABBY
+	ld b, KINGLER
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, SHELLDER
+	ld a, CLOYSTER
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, SHELLDER
+	ld b, CLOYSTER
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, HORSEA
+	ld a, SEADRA
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, HORSEA
+	ld b, SEADRA
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	ld b, TENTACOOL
+	ld a, TENTACRUEL
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .choose_hand
+	ld a, TENTACOOL
+	ld b, TENTACRUEL
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .choose_hand
+	jr .no_carry
+
+; card was found as target in deck,
+; look for card in hand to trade with
+.choose_hand
+	ld [wce1a], a
+	ld a, SEEL
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, KRABBY
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, HORSEA
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, SHELLDER
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	ld a, TENTACOOL
+	call CheckIfHasCardIDInHand
+	jr c, .set_carry
+	; none found
+
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_PowerGenerator: ; 2200b (8:600b)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, PIKACHU2
+	ld a, RAICHU1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jp c, .find_duplicates
+	ld b, PIKACHU1
+	ld a, RAICHU1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, PIKACHU2
+	ld b, RAICHU1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, PIKACHU1
+	ld b, RAICHU1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, VOLTORB
+	ld a, ELECTRODE2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, VOLTORB
+	ld a, ELECTRODE1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, VOLTORB
+	ld b, ELECTRODE2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, VOLTORB
+	ld b, ELECTRODE1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, MAGNEMITE1
+	ld a, MAGNETON2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, MAGNEMITE2
+	ld a, MAGNETON2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, MAGNEMITE1
+	ld a, MAGNETON1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, MAGNEMITE2
+	ld a, MAGNETON1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, MAGNEMITE2
+	ld b, MAGNETON2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, MAGNEMITE1
+	ld b, MAGNETON2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, MAGNEMITE2
+	ld b, MAGNETON1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, MAGNEMITE1
+	ld b, MAGNETON1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	; bug, missing jr .no_carry
+
+; since this last check falls through regardless of result,
+; register a might hold an invalid deck index,
+; which might lead to hilarious results like Brandon
+; trading a Pikachu with a Grass Energy from the deck.
+; however, since it's deep in a tower of conditionals,
+; reaching here is extremely unlikely.
+
+; a card in deck was found to look for,
+; check if there are duplicates in hand to trade with.
+.find_duplicates
+	ld [wce1a], a
+	call FindDuplicatePokemonCards
+	jr c, .set_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret
+
+AIDecide_PokemonTrader_FlowerGarden: ; 220a8 (8:60a8)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, BULBASAUR
+	ld a, IVYSAUR
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, IVYSAUR
+	ld a, VENUSAUR2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, BULBASAUR
+	ld b, IVYSAUR
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, IVYSAUR
+	ld b, VENUSAUR2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, BELLSPROUT
+	ld a, WEEPINBELL
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, WEEPINBELL
+	ld a, VICTREEBEL
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, BELLSPROUT
+	ld b, WEEPINBELL
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, WEEPINBELL
+	ld b, VICTREEBEL
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, ODDISH
+	ld a, GLOOM
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, GLOOM
+	ld a, VILEPLUME
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, ODDISH
+	ld b, GLOOM
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, GLOOM
+	ld b, VILEPLUME
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	jr .no_carry
+
+; a card in deck was found to look for,
+; check if there are duplicates in hand to trade with.
+.find_duplicates
+	ld [wce1a], a
+	call FindDuplicatePokemonCards
+	jr c, .found
+.no_carry
+	or a
+	ret
+.found
+	scf
+	ret
+
+AIDecide_PokemonTrader_StrangePower: ; 22122 (8:6122)
+; looks for a Pokemon in hand to trade with Mr Mime in deck.
+; inputting Mr Mime in register e for the function is redundant
+; since it already checks whether a Mr Mime exists in the hand.
+	ld a, MR_MIME
+	ld e, MR_MIME
+	call LookForCardIDToTradeWithDifferentHandCard
+	jr nc, .no_carry
+; found
+	ld [wce1a], a
+	ld a, e
+	scf
+	ret
+.no_carry
+	or a
+	ret
+
+AIDecide_PokemonTrader_Flamethrower: ; 22133 (8:6133)
+; for each of the following cards,
+; first run a check if there's a pre-evolution in
+; Play Area or in the hand. If there is, choose it as target.
+; otherwise, check if the evolution card is in
+; hand and if so, choose it as target instead.
+	ld b, CHARMANDER
+	ld a, CHARMELEON
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld b, CHARMELEON
+	ld a, CHARIZARD
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, CHARMANDER
+	ld b, CHARMELEON
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld a, CHARMELEON
+	ld b, CHARIZARD
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, VULPIX
+	ld a, NINETAILS1
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, VULPIX
+	ld b, NINETAILS1
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, GROWLITHE
+	ld a, ARCANINE2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, GROWLITHE
+	ld b, ARCANINE2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	ld b, EEVEE
+	ld a, FLAREON2
+	call LookForCardIDInDeck_GivenCardIDInHandAndPlayArea
+	jr c, .find_duplicates
+	ld a, EEVEE
+	ld b, FLAREON2
+	call LookForCardIDInDeck_GivenCardIDInHand
+	jr c, .find_duplicates
+	jr .no_carry
+
+; a card in deck was found to look for,
+; check if there are duplicates in hand to trade with.
+.find_duplicates
+	ld [wce1a], a
+	call FindDuplicatePokemonCards
+	jr c, .set_carry
+.no_carry
+	or a
+	ret
+.set_carry
+	scf
+	ret