Dragon Ball Kai • S07E44 : Buu Gobbles up Buu! Onslaught of a New Majin!
Buu attempts to fight against the Evil Buu, but out that finds he is much weaker, as most of his power had been transferred over to his evil side. As such, Evil Buu manages to reflect Buu's candy attack back at him, turning him into chocolate before eating him and gaining his power, giving him a more complete form. Sensing the energy of Piccolo and the others, Evil Buu arrives at Kami's Palace, demanding to fight against Gotenks