Older Cheats:
(last update - Aug 07 2000)
Create a player and use all available ability points. Save your player to a VMU, exit the game, and then start the game again. IN Player Edit mode, choose your player and add the extra ability points.
On rookie difficulty setting, hold the Analog-stick slightly in any direction while batting and the batting cursor will automatically follow the ball.
While playing defense, just before the computer catches the ball, press A and the direction of the base you want to throw towards.
Hit a homerun with the home team in their stadium during a night game.
At Pacific Bell Park, hit three homeruns into McCovey Cove