Master code:
Hold Z and press A, B, R, A(2), B, R, A at the title screen. All selections in the Puzzle University will be unlocked.

V-Hard difficulty setting:
Hold Z and press L(2), A, and B at the difficulty selection screen. Alternately, successfully complete the game under the Hard difficulty setting.

S-Hard difficulty setting:
Hold Z and press R, L, A, B at the difficulty selection screen. Alternately, successfully complete the game under the V-Hard difficulty setting.

Mewtwo level:
Hold Z and press B, Up, L, B, A, Start, A, Up, R at the trainer selection screen. Alternately, successfully complete the game under the S-Hard difficulty setting.

Turbo mode:
Hold Z and press B, A, L(2) at the title screen. The game speed can now be set over 50 in marathon mode. Alternately, earn over 10,000 points in the Time Zone.

Secret characters:
Hold Z on controller one and simultaneously press L + R on controllers one and two at the two player trainer selection screen. Alternately, successfully complete Spa Service.

Taunts:
Select any two player game mode. Have player one select a character, then repeatedly press A.

Hints:
Continue without continues (1P Stadium):
When you lose and the game asks if you want to retry, select "No". After that, return to the 1P Stadium. Select your name and continue playing. When you see your records, it will be as if you never lost.

Alternately, if you know you are not going to catch up or win, just press Start before you lose and choose "Return to Select".