Move-unique effect commands consistently go in engine/battle/move_effects/

engine/battle/move_effects/belly_drum.asm

@@ -0,0 +1,36 @@
+BattleCommand_BellyDrum: ; 37c1a
+; bellydrum
+; This command is buggy because it raises the user's attack
+; before checking that it has enough HP to use the move.
+; Swap the order of these two blocks to fix.
+	call BattleCommand_AttackUp2
+	ld a, [AttackMissed]
+	and a
+	jr nz, .failed
+
+	callfar GetHalfMaxHP
+	callfar CheckUserHasEnoughHP
+	jr nc, .failed
+
+	push bc
+	call AnimateCurrentMove
+	pop bc
+	callfar SubtractHPFromUser
+	call UpdateUserInParty
+	ld a, 5
+
+.max_attack_loop
+	push af
+	call BattleCommand_AttackUp2
+	pop af
+	dec a
+	jr nz, .max_attack_loop
+
+	ld hl, BellyDrumText
+	jp StdBattleTextBox
+
+.failed
+	call AnimateFailedMove
+	jp PrintButItFailed
+
+; 37c55