Easy Strike Out
While you are selecting a pitch press and hold the top buttons, and press Up, down, tri. sq. tri. cir. x, sq. You will hear a thud if it worked. Pitch a very outside ball and you will K him.
Easy Home Run
Either create a player named Eric Kiss or before the pitcher throws the ball hold R1, R2, L1, L2, and push Triangle, Square, Triangle Circle, X, Square, left and right. If the code worked you will hear a thud. You can even bunt and it will go over the fences!
Hit in this order at the stadium select screen: L2, L1, R1, R2, L1, R1, R2 after you enter the code (if it is done correctly) you will hear the announcer say Triple Play 99.
Hold all top buttons and enter this during the game: Triangle, Square, Triangle, Circle, X, Square, Left, Right. You have to make contact with the ball to hit a homerun.