1 files changed, 112 insertions, 0 deletions
diff --git a/engine/events/dratini.asm b/engine/events/dratini.asm
new file mode 100644
index 000000000..f110b34ab
--- /dev/null
+++ b/engine/events/dratini.asm
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+SpecialDratini: ; 0x8b170
+; if ScriptVar is 0 or 1, change the moveset of the last Dratini in the party.
+;  0: give it a special moveset with Extremespeed.
+;  1: give it the normal moveset of a level 15 Dratini.
+
+	ld a, [ScriptVar]
+	cp $2
+	ret nc
+	ld bc, PartyCount
+	ld a, [bc]
+	ld hl, MON_SPECIES
+	call .GetNthPartyMon
+	ld a, [bc]
+	ld c, a
+	ld de, PARTYMON_STRUCT_LENGTH
+.CheckForDratini:
+; start at the end of the party and search backwards for a Dratini
+	ld a, [hl]
+	cp DRATINI
+	jr z, .GiveMoveset
+	ld a, l
+	sub e
+	ld l, a
+	ld a, h
+	sbc d
+	ld h, a
+	dec c
+	jr nz, .CheckForDratini
+	ret
+
+.GiveMoveset:
+	push hl
+	ld a, [ScriptVar]
+	ld hl, .Movesets
+	ld bc, .Moveset1 - .Moveset0
+	call AddNTimes
+
+	; get address of mon's first move
+	pop de
+	inc de
+	inc de
+
+.GiveMoves:
+	ld a, [hl]
+	and a ; is the move 00?
+	ret z ; if so, we're done here
+
+	push hl
+	push de
+	ld [de], a ; give the Pokémon the new move
+
+	; get the PP of the new move
+	dec a
+	ld hl, Moves + MOVE_PP
+	ld bc, MOVE_LENGTH
+	call AddNTimes
+	ld a, BANK(Moves)
+	call GetFarByte
+
+	; get the address of the move's PP and update the PP
+	ld hl, MON_PP - MON_MOVES
+	add hl, de
+	ld [hl], a
+
+	pop de
+	pop hl
+	inc de
+	inc hl
+	jr .GiveMoves
+
+.Movesets:
+.Moveset0:
+; Dratini does not normally learn Extremespeed. This is a special gift.
+	db WRAP
+	db THUNDER_WAVE
+	db TWISTER
+	db EXTREMESPEED
+	db 0
+.Moveset1:
+; This is the normal moveset of a level 15 Dratini
+	db WRAP
+	db LEER
+	db THUNDER_WAVE
+	db TWISTER
+	db 0
+
+.GetNthPartyMon: ; 0x8b1ce
+; inputs:
+; hl must be set to 0 before calling this function.
+; a must be set to the number of Pokémon in the party.
+
+; outputs:
+; returns the address of the last Pokémon in the party in hl.
+; sets carry if a is 0.
+
+	ld de, PartyMon1
+	add hl, de
+	and a
+	jr z, .EmptyParty
+	dec a
+	ret z
+	ld de, PARTYMON_STRUCT_LENGTH
+.loop
+	add hl, de
+	dec a
+	jr nz, .loop
+	ret
+
+.EmptyParty:
+	scf
+	ret
+; 8b1e1