Unlock Game Editor
     This  codes lets you access the game editor, where you can choose
what  teams  are  playing, the location, the inning, the score, and so
on. Go to the pause menu and press Square, Square, Circle, Circle, L1,
R1.  You  will hear a chime. Then press all four shoulder buttons (R1,
R2, L1, L2).

     This  will  turn  on Ball Cannon, which allows you to control the
speed  and  direction  of pitches, and Game State, which allows you to
set up games as you wish.