Black and Bruised GameCube Cheats

 
Gamecube
Choose the Cheat option at the Setup menu and enter the following:
All Boxers
 Start, A, Y, X, X, Z, Z, X, Y, A, Start
Invincibility
 Start, A, A, Y, Y, Z, Z, X, X, Start
Intercontinental Tourney
 Start, A, A, A, Y, Y, Y, X, X, X, Start
Conversation Mode
 Start, Z, A, Y, X, Z, Z, Z, Start
Boxers Life Mode
 Start, A, X, Y, Z, A, X, Y, Z, Start
Scrap Yard Arena
 Start, Y, Z, Y, Z, A, A, Start
New Outfits
 Start, A, Z, Y, X, Start
Turbo Mode
 Start, Z, Z, Z, Z, Z, Z, Z, Z, Z, Z, Start.
Rapid Power Up Mode
 Start, A, Y, A, Y, A, Y, X, X, X, Start
Thanks to Revolution reader Adam Kirch!