Pokemon: Season 15, Episode 18

15 - 18: Baffling the Bouffalant!

While on the way to Mistralton City, Iris, Axew, Snivy, Tepig, and Oshawott get separated from Ash and Cilan in an area where herds of territorial Bouffalant roam. They attack anyone who is not a Bouffalant and so everyone mush disguise themselves in order to escape their territory.