Pokémon — Episode 13: Sleight of Sand!

You are watching the episode Sleight of Sand! When our heroes' Pokémon are having a fun time in a sandpit, a Hippowdon appears from within. However, the over-curious Pachirisu can't help peeping into the Hippowdon's mouth and accidentally falls into it. The situation gets worse when Hippowdon becomes the target of the Team Rocket duo Butch and Cassidy.