Various Cheats

Enter any of the following "Names" as your gym name:

Name             Effect
Rumble Power     Unlock Bronze Class
Rumble Bumble    Unlock Silver Class
Mosma!           Unlock Gold Class
Pod 5!           Unlock Champ Class and All Hidden Fighters

Fight at Gym
     In Two-Player mode and at the Character Selection screen, press L
+ R while choosing a boxer.

Fight at Outdoor Arena
     In Two-Player mode and at the Character Selection screen, press X
+ L + R while choosing a boxer.

Regain Energy
     After  you dkock down your opponent, rotate the Analog Stick in a
full circle.

Differnt Cornerman Voices
     At the Character Selection screen, press X + D-Pad

Taunt Opponent
     During the match, press X + A or Y + B.

Alternate Costumes
     At the Character Selection screen, press X + Y + Z.

Cheap Vitamins
     Train  your  boxer in Championship Mode. Go to Aerobics and press
Left,  then  press  A  quickly. If done correctly, you will purchase a
$25,000  vitamin bottle for $500. Also, you can do this for any of the
training material.