Talk through wall
In pyrite Town, go to the jail to find the people that tried to kidnap your friend earlier in one of the cells. Go into the cell directly adjacent to there cell. To do this pick up the jail key on the desk when you first enter the buildind. You can talk to them from your cell directly through the wall.
Ultimate mode move
When you are undera quick fight under ultimate mode, if you fight the trainer with swellow and ninjask the first move the oppents ninjask uses is toxic on the foe swellow.
Charizard flies threw ground
Teach your charizard fly, then take it to mt. battle, use fly on the first foe and charizard will go threw the ground.
Skiplooms Shadow
When fighting skiploom look at its shadow, it will be three squares, instead of three circles.
Wrong picture
When you look at Yanma on the p*da it will be a picture of remoraid instead.
Infinite masterballs
In battle, on your first pokemon's turn, use your masterball. Then on your second, turn switch the masterball with some other ball, then perform any move. On your next turn you will have caught the pokemon and still have your masterball.
float above steps
When your player goes up and down the stares on Mt.Battle, he never touchs them.