Cheats for All-Star Baseball 2001 (GBC)

Hit a chopper
Press B + Left to hit a chopper to third base. About 70% of the time, you will hit an infield single. If you do not hit a chopper, you will hit a short grounder (slightly longer than a bunt). If it goes to third base, you have a better chance of getting a single then when it goes to the pitcher and/or first baseman.

Easy homeruns
Press B + Up to hit easy homeruns. This also works with pitchers.