Use Bro Flowers until his drink turns greyish blackish, when he drinks that he becomes weakened and take FULL damage from attacks, you can tell he is weakened because he will look sick, continue to use bro flower after it turns grey or if he is already sick it will turn red and heal him, when he is sick use cannon ballers, instant mega damage and its easy to pull off as long as you watch top screen, 1ups, mushrooms, and mushroom drops are very usefull in this battle