Slaking Kong! - S9.E32

On the way to the Grand Festival, our heroes are swarmed by a group of Aipom who swipe Ash's hat and May's ribbon case! That's not all—the Aipom also cleaned out an orchard belonging to a farmer, Taylor. He says the local Pokémon have started acting strangely, and it might have something to do with a strange monster recently seen in the mountains. Everyone sets out to investigate and get May's ribbons back.