After defeating the Koopa Kids once, Kamek casts a spell to make them tougher for the rematch. In Yoshi's Island and Yoshi's Island DS, he also cast spells on those Bosses that made them tougher.

When fighting Bowser after you press the button, Kemek will cast a spell on Bowser to make him bigger and stronger. This also happens in Yoshi's Island DS.