Shrink & Grow:
This code works in Vs. CPU or Vs. Player modes only. At the character select screen hold R2 + L2 + Triangle then select your character. Continue to hold these buttons until Round 1 appears. While playing, you can use the R2 & L2 buttons to grow & shrink your character. Try shrinking your character so you can't be hit then toast your opponent with fireballs.