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

engine/battle/move_effects/protect.asm

@@ -0,0 +1,80 @@
+BattleCommand_Protect: ; 37618
+; protect
+	call ProtectChance
+	ret c
+
+	ld a, BATTLE_VARS_SUBSTATUS1
+	call GetBattleVarAddr
+	set SUBSTATUS_PROTECT, [hl]
+
+	call AnimateCurrentMove
+
+	ld hl, ProtectedItselfText
+	jp StdBattleTextBox
+; 3762c
+
+
+ProtectChance: ; 3762c
+
+	ld de, PlayerProtectCount
+	ld a, [hBattleTurn]
+	and a
+	jr z, .asm_37637
+	ld de, EnemyProtectCount
+.asm_37637
+
+	call CheckOpponentWentFirst
+	jr nz, .failed
+
+; Can't have a substitute.
+
+	ld a, BATTLE_VARS_SUBSTATUS4
+	call GetBattleVar
+	bit SUBSTATUS_SUBSTITUTE, a
+	jr nz, .failed
+
+; Halve the chance of a successful Protect for each consecutive use.
+
+	ld b, $ff
+	ld a, [de]
+	ld c, a
+.loop
+	ld a, c
+	and a
+	jr z, .done
+	dec c
+
+	srl b
+	ld a, b
+	and a
+	jr nz, .loop
+	jr .failed
+.done
+
+.rand
+	call BattleRandom
+	and a
+	jr z, .rand
+
+	dec a
+	cp b
+	jr nc, .failed
+
+; Another consecutive Protect use.
+
+	ld a, [de]
+	inc a
+	ld [de], a
+
+	and a
+	ret
+
+
+.failed
+	xor a
+	ld [de], a
+	call AnimateFailedMove
+	call PrintButItFailed
+	scf
+	ret
+; 3766f