Pokémon — Episode 39: Steamboat Willies!

You are watching the episode Steamboat Willies! On their way to Hearthome City for Dawn's next Pokémon Contest and Ash's next Gym battle, they let their Pokémon play in a steamboat while they go shopping. However, the steamboat ends up running away with only Ash, Brock and Dawn's Pokémon still on board, which presents everyone with a real crisis.