Cheat mode
At the title screen, hold Z and press A, B, R, A(2), B, R, A to unlock all selections in the Puzzle University.
High speed marathon mode
At the title screen, hold Z and press B, A, L(2) to be able set the starting speed in marathon mode to a maximum of 99. Alternately, score at least ten thousand points in the time zone. -From: Michael Walker
Bonus trainers
At the trainer selection screen, hold L + R + Z on controller one and two to unlock the trainers marked by a "?". Alternately, successfully complete the Spa Service game. -From: Michael Walker
Mewtwo's stage
At the trainer selection screen, hold Z and press B, Up, L, B, A, Start, A, Up, R to start the game in Mewtwo's stage. Player one will be Ash, player two will be Mewtwo. Alternately, successfully complete the game on the S-Hard difficulty setting. -From: Michael Walker
V-Hard difficulty setting
At the difficulty selection screen, hold Z and press L(2), A, B to unlock the V-Hard difficulty setting. Alternately, successfully complete the game on the Hard difficulty setting. -From: Michael Walker
S-Hard difficulty setting
At the difficulty selection screen, hold Z and press R, L, A, B to unlock the S-Hard difficulty setting. Alternately, successfully complete the game on the V-Hard difficulty setting. -From: Michael Walker
Taunt opponent
Select any two player game mode. Have one player select a character, then repeatedly press A.
Badges
Defeat one of the following characters to earn the corresponding badge: Character - Badge
Brock - Boulder
Misty - Cascade
Lt. Surge - Thunder
Koga - Sould
Erika - Rainbow
Sabrina - Marsh
Blaine - Volcano
Giovanni - Earth
Unlock V-Hard Mode:
On 1-Player Stadium go to the difficulty selection screen and hold the Z button and press L, L, A, B.
Unlock S-Hard Mode:
On 1-Player Stadium go to the difficulty selection screen and hold the Z button and press R, L, A, B.
Start From Level 50-99 in Marthon Mode:
At the Title screen hold Z and press B, A, L, L. You will hear a sound if the code has been entered correctly.
Unlock ALL Puzzles in Puzzle University:
At the Title screen hold Z and press A, B, R, A, A, B, R, A. You will hear a sound if the code has been entered correctly.