When you come to bat, hold the analog stick diagonally up and left and press the B button. If your position is correct you will hit a homerun most of the time.
Hit a homer
Hold L+R+Z and press Left, Up, Left, Up when your batter is in the batter's box but has not recieved the first pitch.
Increase Score x 1
To increase the home team score by one hold L+R+Z and press C-Left twice. To increase the away team score by 1 hold L+R+Z and press C-Right twice.
Instant Strikeout
Hold L+R+Z and press Right, Up, Right, Up.
Instant Three Outs
Hold L+R+Z and press Down,Up.
Three Ball Count
Hold L+R+Z and press Up, Down while in the batters box.
Easy Homeruns...