Save the Lost Hippopotas! : Season 10 Episode 44

Continuing en route to Hearthome City, Ash's Turtwig suddenly alerts our Heroes to what they later learn is a Hippopotas stranded on a precarious ledge. After much effort, Ash is finally able to rescue the terrified Pokémon and soon learns that it has been separated from its herd and lost. Deciding to take Hippopotas back to its friends, they discover that Team Rocket has other, more fiendish ideas, and several confrontations between them take place, while one by one all parties become victim to Hippopotas' Yawn attack, which puts the recipient into a deep sleep. But ...