Rocky

Double Damage Mode:
Hold R and press Right, Down, Left, Up, Left and L at the main menu.

Double Speed Mode:
Hold R and press Down, Left, Down, Up, Right and L at the main menu.

Maximum Stats (Movie):
Hold R and press Right, Down, Down, Up, Left and L on the main menu.

Maximum Stats (Tournament and Exhibition):
Hold R and press Left, Up, Up, Down, Right and L on the main menu.

Unlock All Boxers and Arenas:
Hold R and press Up, Down, Down, Left, Left and L at the main menu.