Enter all these cheats after you go into championship mode and name your gym this: to get all bronze class boxers: name your gym "RUMBLE POWER!"
to get all silver claas boxers: name your gym "RUMBLE BUMBLE!"
to get all gold class boxers: name your gym "MOSMA!"
to get all champ class boxers: name your gym "POD 5!" Alternate costumes:at the character select screen, press X+Y repeatedly Alternate cornerman: At the character select screen hold X and press up, right, down, or left High voice cornerman: at the character select screen hold X and press L+R simaltainiously Fight in the gym: enter the arcade mode and choose two-player.At character select screen both players must press and hold L+R while selecting their characters with A