Rocky

Go to the main menu and enter the following button combinations:

Unlock every boxers, arenas, Rocky Statue, and Mickey Goldmill
Hold R and press Up, Down, Down, Left, Left, L.

Unlock every boxers, arenas, Rocky Statue
Hold R and press Right, Right, Right, Left, Right, L.

Unlock every boxers and arenas
Hold R and press Right, Down, Up, Left, Up, L.

2x speed boxing
Hold R and press Down, Left, Down, Up, Right, L.

2x punch damage
Hold R and press Right, Down, Left, Up, Left, L.

Maximum stats in tournament and exhibition modes
Hold R and press Left, Up, Up, Down, Right, L.

Maximum stats in movie mode
Hold R and press Right, Down, Down, Up, Left, L.

Unlock Gold Class Tournament
Finish the Silver mode of the Knockout Tournament

Unlock Silver Class Tournament
Finish the Bronze mode of the Knockout Tournament

Unlock Mickey Goldmill
Finish movie mode in champ mode

Rocky Statue
Finish movie mode in contender mode