First, beat the game to get extra options.Then, go to extra options and make transformation damage on 0% and turn power guage timer off. Next, play the game and collect all of the powerstones and you will be invincible. NOTE:You will not get hurt while transformed, but the only bad thing is that you can't press L or R while transformed or you will turn back to normal.You also can't press the buttons that make you do a special move while transformed or else the power guage timer will decrease by a little.So the thing to do while using this trick is throw stuff at your opponent,pick up items and kill with that,hit em with a pole, or you can press the B button to throw them.