Bowser returns, but instead of fighting him with Mario, you fight him with Luigi. You must beat Giant Bowser two times. This isn't as easy as the first Trouble King match. Bowser is much stronger and harder to kill. Although Bowser is big, it is easy to get him to fall below. Get Bowser to fight near the edge of one of the floats. Since he is big, Bowser will have a hard time recovering. Another way to kill him is give him high damage then throw him off the arena. one of the easiest things to do is take out one of his lives with an up-B, and then to take out the other when he's on the Onix float. lure him to the left side, then simply grab him and chuck him off.