Must be in cheat mode to activate the following cheats:
To enter cheat mode begin playing a new game. Pause the game and on controller 2 press to following: T S X C C C. If done correctly you will hear a piano sound.
Advance an inning
Press X to bring up "Let's Go Inning=" in the upperleft hand corner. Then change inning up to 18 using the X button. example X X X would bring you to the 3rd inning.
Home Run Everytime
Press L1 and you'll hear "Home Run". Then unpause the game. This cheat is a toggle.
Computer Take Over
Press L2 and unpause the game. This cheat is a toggle.