Enter the following codes at the main menu:
All Boxers, Arenas, Rocky Statue & Mickey: Hold R and press Right, Down, Left, Up, Left, L
2X Speed Boxing: Hold R and press Down, Left, Down, Up, Right, L
All Boxers, Arenas & Rocky Statue: Hold R and press Right, Right, Right, Left, Right, L
All Default Boxers & Arenas: Hold R and press Right, Down, Up, Left, Up, L
2X Punch Damage: Hold R and press Right, Down, Left, Up, Left, L
Max Stats for Movie Mode: Hold R and press Right, Down, Down, Up, Left, L
Max Stats: Hold R and press Left, Up, Up, Down, Right, L
Win Fight in Movie Mode: Hold R and press Right, Right, Left, Left, Up, L. During the fight press Black + White to win fight
Silver Class Tournament: Win the Knockout Tournament on Bronze
Gold Class Tournament: Win the Knockout Tournament on Silver
Mickey Goldmill: Win the Movie Mode on Champ setting
Rocky Statue: Win the Movie Mode on Contender Setting