S11·E29 Chim-Charred!

Ash and co. are running after Gligar who has been blown away by a gust, and promptly run into Paul. After a huge argument about their different ways of treating Pokémon, Ash challenges Paul to a battle. But when Chimchar is battling Paul's Ursaring, it activates an overpowering blaze. Chimchar also gets confused and starts randomly attacking anyone in its path.