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 upper-left 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.