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diff --git a/src/constants/deck_ai_constants.asm b/src/constants/deck_ai_constants.asm
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+; wPreviousAIFlags and wCurrentAIFlags constants
+AI_FLAG_USED_PLUSPOWER     EQU 1 << 0
+AI_FLAG_USED_SWITCH        EQU 1 << 1
+AI_FLAG_USED_PROFESSOR_OAK EQU 1 << 2
+AI_FLAG_MODIFIED_HAND      EQU 1 << 3
+AI_FLAG_USED_GUST_OF_WIND  EQU 1 << 4
+
+; used as input for AIProcessEnergyCards to determine what to check
+; and whether to play card after the routine is over.
+; I suspect AI_ENERGY_FLAG_DONT_PLAY to be a flag to signal the routine
+; not to actually play the energy card after it's finished,
+; but AIProcessEnergyCards checks whether ANY flag is set in order
+; to decide not to play it, so it's redundant in the presence of another flag.
+AI_ENERGY_FLAG_DONT_PLAY       EQU 1 << 0 ; whether to play energy card (?)
+AI_ENERGY_FLAG_SKIP_EVOLUTION  EQU 1 << 1 ; whether to check if card has evolutions
+AI_ENERGY_FLAG_SKIP_ARENA_CARD EQU 1 << 7 ; whether to include Arena card in determining which card to attach energy
+
+; used to determine which Trainer cards for AI
+; to process in AIProcessHandTrainerCards.
+; these go in chronological order, except for
+; AI_TRAINER_CARD_PHASE_14 which happens just before AI attacks.
+; AI_TRAINER_CARD_PHASE_15 is reserved for Professor Oak card.
+; if Professor Oak is played, all other Trainer card phases
+; are processed again except AI_TRAINER_CARD_PHASE_15.
+	const_def 1
+	const AI_TRAINER_CARD_PHASE_01 ; $1
+	const AI_TRAINER_CARD_PHASE_02 ; $2
+	const AI_TRAINER_CARD_PHASE_03 ; $3
+	const AI_TRAINER_CARD_PHASE_04 ; $4
+	const AI_TRAINER_CARD_PHASE_05 ; $5
+	const AI_TRAINER_CARD_PHASE_06 ; $6
+	const AI_TRAINER_CARD_PHASE_07 ; $7
+	const AI_TRAINER_CARD_PHASE_08 ; $8
+	const AI_TRAINER_CARD_PHASE_09 ; $9
+	const AI_TRAINER_CARD_PHASE_10 ; $a
+	const AI_TRAINER_CARD_PHASE_11 ; $b
+	const AI_TRAINER_CARD_PHASE_12 ; $c
+	const AI_TRAINER_CARD_PHASE_13 ; $d
+	const AI_TRAINER_CARD_PHASE_14 ; $e, just before attack
+	const AI_TRAINER_CARD_PHASE_15 ; $f, for Professor Oak
+
+; used by wAIBarrierFlagCounter to determine
+; whether Player is running Mewtwo1 mill deck.
+; flag set means true, flag not set means false.
+AI_FLAG_MEWTWO_MILL EQU 1 << 7
+
+; defines the behaviour of HandleAIEnergyTrans, for determining
+; whether to move energy cards from the Bench to the Arena or vice-versa
+; and the number of energy cards needed for achieving that.
+AI_ENERGY_TRANS_RETREAT  EQU $9 ; moves energy cards needed for Retreat Cost
+AI_ENERGY_TRANS_ATTACK   EQU $d ; moves energy cards needed for second attack
+AI_ENERGY_TRANS_TO_BENCH EQU $e ; moves energy cards away from Arena card
+
+; used to know which AI routine to call in
+; the AIAction pointer tables in AIDoAction
+	const_def 1
+    const AIACTION_DO_TURN       ; $1
+    const AIACTION_START_DUEL    ; $2
+    const AIACTION_FORCED_SWITCH ; $3
+    const AIACTION_KO_SWITCH     ; $4
+    const AIACTION_TAKE_PRIZE    ; $5