First Commit

Upload literally everything from the pokecrystal16 expand-move-ID branch

engine/battle/move_effects/perish_song.asm

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+BattleCommand_PerishSong:
+	ld hl, wPlayerSubStatus1
+	ld de, wEnemySubStatus1
+	bit SUBSTATUS_PERISH, [hl]
+	jr z, .ok
+
+	ld a, [de]
+	bit SUBSTATUS_PERISH, a
+	jr nz, .failed
+
+.ok
+	bit SUBSTATUS_PERISH, [hl]
+	jr nz, .enemy
+
+	set SUBSTATUS_PERISH, [hl]
+	ld a, 4
+	ld [wPlayerPerishCount], a
+
+.enemy
+	ld a, [de]
+	bit SUBSTATUS_PERISH, a
+	jr nz, .done
+
+	set SUBSTATUS_PERISH, a
+	ld [de], a
+	ld a, 4
+	ld [wEnemyPerishCount], a
+
+.done
+	call AnimateCurrentMove
+	ld hl, StartPerishText
+	jp StdBattleTextbox
+
+.failed
+	call AnimateFailedMove
+	jp PrintButItFailed