Select the "Cheats" option and enter "ALLMINE" as a code. If you entered the code correctly, you will hear a sound.
Game Shark Codes
Master Code (Must Be On) 3EABFE16 FC83CA2BDE131412 A0A2890F
Infinite Retries FE344F0A A0AD4C23
Infinite ACME Tokens DEA5CC0E C19E7B82
Max Race Points CE000F2E BCA99E6A
Unlock All Events DEA5CC2E BBA89A82
Unlock All Galleria Items DEA5CC22 BCB89A82
Unlock All Planets CEA5CC1E BCA99A82
Unlock All Gold Medals in Tourney CEA5CC30 BCA99A7B
Unlock Extra Characters CEA5CC24 BCA99C82