Pokemon Season 5 - Episode 273 – Hoenn Alone!

Ash finally arrives at his destination: Littleroot Town. Shortly after, Team Rocket steals Pikachu. Soon, Pikachu and Meowth get lost and meet a lot of lonely Pokémon. Team Rocket returns to steal Pikachu and save Meowth, but are defeated. In the end, Ash finds out that Pikachu is ill.