Cheats for Ready 2 Rumble Boxing (GBC)
Hightlight Arcade mode, then enter the codes.
Unlock Damien Black
Right, Left, Right, Right, Left, Left, Right, Right, Right, Left, Left, Left
Unlock Kemo Claw
Left, Left, Left, Right, Right, Right, Left, Right, Left, Right
Unlock Nat Daddy
Right, Right, Right, Left, Left, Left, Right, Left, Right, Left