To defeat the final Bowser very easily, stand on the edge of the arena opposite of Bowser, next to a bomb. Face the outside (make sure you can still see Bowser) and hold (Z). When he charges at you, press (A) and you will backflip over him. Press (B) to grab his tail and you will have his face already stuffed in the bomb -- you do not have to aim or even throw him. Press (B) again and repeat the sequence again. After you blow him up a few times, the edges will fall out of the arena and it will turn into a star. Do not fall off along with them. Go to a corner of the star and do the same thing, but you will now have to throw him. Go to the middle and get the big star. Some things will happen and you just basically complete the entire game.