Historical Cheat
While playing either field or batter, hold all four shoulder buttons and press Up, Triangle, Right, Circle until you hear a "thump" which confirms the code. If done correctly, the announcers will talk about something that happened in baseball history.
EA Dream Team
Start an Exhibition game. At the Team Select screen press Left, Right, Left, Right, Left, Right, Left, Right, Left, Right, Left, Right. You should hear a voice to confirm entry.
Camera Control
While playing, hold all four shoulder buttons (L1+R1+L2+R2), then press Right, Left, Up, Down, Right, Left.
To operate the camera do the following: R1+Directional buttons will turn the camera. L1+Directional buttons will make the camera move faster. Just L2 by itself will make the camera zoom out and R2 will make it zoom in. Triangle button by itself will give a high view. Square button by itself will give a low view.
Automatic Strikeout
When pitching, press and hold L1 + L2 + R1 + R2 and while holdin these buttons, press Up, Down, Triangle, Square, Triangle, Circle, X, Square.
Automatic Homerun
While batting up, hold all four shoulder buttons then press Triangle, Square, Triangle, Circle, X, Square, Left, Right.
Strikeout Strategy
When pitching, if you have a knuckleball, throw it low out of the strike zone. Most times, the computer will chase the pitch. I recommend only using it with 2 strikes.