checked-part =>Erase All Saved Data: On the Puzzle Village menu screen, hold Z and press cU cD cL cR A B A B and choose YES when the game asks if you want to delete the data. ->Enable All Trainers: To enable any of the trainers, go to the Two Player Stadium and on the trainer select screen hold CNTRL I & II: [L]+[R]+Z. This will not enable Mewtwo, however. ->Special Puzzles: Once you solve all the normal puzzles at Puzzle University, you will view the credits and be rewarded with 130 Special Puzzles. ->Very Hard Mode: To enable the Very Hard mode without reaching it normally, hold Z and press [L] [L] B A on the stage select screen. ->Mewtwo Mode: To play as Mewtwo, go to the two player trainer select screen, hold CNTRL I: Z and press B U [L] B A [START] A U [R]. You will now enter a two player battle, with player one as Ash and player two as Mewtwo. Both will use Pikachu. ->Cheat Mode: On the title screen, hold Z and press A B [R] A A B [R] A. A tone will sound. Start the game and you will find that all the difficulty settings in One Player stadium are open and that all puzzles are available. Reenter the code to return the game to normal. ->Glitched Graphics: Go to the Pokemon Center and view the profiles. Use [R] to go to the end of the profiles and reach Mewtwo's profile. Even if his profile is not yet visible, keep pressing [R] until you reach the end of the trainer profiles. Hold Z and press A B [R]. Return to the title screen and wait until the trainer profiles appear in the demo. You will notice that the pictures of the trainers will be switched with parts of the title screen. The graphical glitching grows worse as more profiles appear. ->Frozen Game: After a two player game, wait on the victory screen. If you leave the system alone long enough, it will freeze.