1 files changed, 81 insertions, 0 deletions
diff --git a/battle/effects/protect.asm b/battle/effects/protect.asm
new file mode 100644
index 000000000..80edc0d85
--- /dev/null
+++ b/battle/effects/protect.asm
@@ -0,0 +1,81 @@
+BattleCommand55: ; 37618
+; protect
+	call ProtectChance
+	ret c
+
+	ld a, BATTLE_VARS_SUBSTATUS1
+	call GetBattleVarPair
+	set SUBSTATUS_PROTECT, [hl]
+
+	call Function0x37e01
+
+	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 Function0x36abf
+	jr nz, .failed
+
+; Can't have a substitute.
+
+	ld a, BATTLE_VARS_SUBSTATUS4
+	call CleanGetBattleVarPair
+	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 Function0x37e77
+	call PrintButItFailed
+	scf
+	ret
+; 3766f
+