Super weapons:
Select the "Team Edit" option and choose team A or B. Enter Terminator 2 as a name. Laser guns will be available for team A and laser swords will be available for team B.

Eliminate opposing team:
Intentionally hit each batter with a pitch until he explodes. The opposing team will forfeit the game after enough players have been destroyed.

Hint: Opponent cannot hit pitch:
Go to whatever side of the mound that the batter is on. For example, if the batter is right handed, go on the left side of the mound from the view that you have. Press A to pitch the ball as usual. Then, pitch the ball in the direction of the batter until he moves as far as he can from the plate. For example, if the batter is right-handed, press Left to move the batter away from the plate. Then, when the batter is as far away from the plate as possible, push the opposite direction on the D-pad so the ball changes direction directly in front of the batter and goes over the plate. The batter will always at it unless you pitch incorrectly. If the batter hits the ball, it will be a foul and count as a strike anyway. Note: If this trick is done incorrectly, the batter will hit the ball very far or will not swing.