Hold L + R + Z and press Down, Up during game play. Your opponent will get three outs automaticaly

While batting, press and hold Z + R + L and press Up, Down.

After hitting a homerun, press C-Up or C-Right to hear air horns, or C-down to hear whistles while running around the bases.

While playing hold L + R + Z then press C-Right twice.

While playing hold L + R + Z then press C-Left twice.

Hold L, R and Z simultaneously and press the d-pad RIGHT, UP, RIGHT, UP while pitching to strike the batter out.

Hold L, Z, and R, at the same time and press left, up, left up until a thump is heard. Then make contact with the ball. If you put it in fair territory it will be a homerun. You can even hit homeruns while bunting. But if you swing and miss or don't swing at all the code must be entered again.