Increased Difficulty Modes - To open up V-Hard mode, go to One-Player Stadium and to the difficulty selection screen. There, hold the Z button, and press L, L, A, B.

To open up S-Hard mode, again go to the difficulty selection screen, but this time 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 should hear a sound if 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 should hear a sound if entered correctly.

Unlock All Trainers - Start a 2 player game and at the ''Trainer Select'' screen hold Z + L + R on controller 1 and controller 2 at the same time.

Unlock Mewtwo Stage - To access the secret Mewtwo stage in Two-Player battle, go to the Select Trainer screen in 2-P Stadium. Now, hold the Z button, and press B, Up, L, B, A, Start, A, Up, R. You'll automatically be transported to Mewtwo's stage. Player one will always be Ash Ketchum and player two will be Mewtwo.