by the way... the bowser's inside story boss has 2 stages...
for the first stage of the fight, Kill the shadow bowser as bowser.
then, when he is dead, fawful will revive him and make him really big.
use your bowser punch and hit shadow bowser in the stomach.he will turn small again.
use your vacuum attack and eat fawful.
when he's inside bowser, fawful will turn into this:
http://www.mariowiki.com/Image:Dfawfulb.JPG
and you will fight him as mario and luigi
take out his glasses and his lags.
then hit the Dark star core(that thing on his had)
kepp doing that until he's dead.