Press X + L + R at the character selection screen.
Champ class boxers:
Enter championship mode and enter POD 5! as a gym name. (Note:
Include the exclamation point and the space between "D" and "5").
Exit championship mode and enter arcade mode to have access to
all the boxers including Damien Black.
Gold class boxers:
Enter championship mode and enter MOSMA! as a gym name. Note:
This also unlocks Nat Daddy in arcade mode.
Silver class boxers:
Enter championship mode and enter RUMBLE BUMBLE as a gym name.
Note: This also unlocks Bruce Blade in arcade mode.
Bronze class boxers:
Enter championship mode and enter RUMBLE POWER as a gym name.
Note: This also unlocks Kemo Claw in arcade mode.
Alternate costumes:
Press X + Y at the character selection screen.
Alternate cornerman voices:
Press X + D-pad at the character selection screen.
