Episode 186
Ash and friends continue thier journey to the Battle Pyramid for Ash's final symbol. They come across a injured wild Weavile. They try to help it but it attacks and badly injures Aipom. They find out from a townperson that Weavile was attacked by a member of its own group instead of a Sneasel. Ash and friends then decide to find Weavile and help it beat its adversary.
Aired 27/07/2006EP 186 - Episode 186

Pokémon the Series: Ruby and Sapphire
After participating in the Johto League, Ash decides to begin anew in yet another journey; this time by himself and Pikachu, in the land of Hoenn. Though he isn't alone for long, as 10-year-old May (who dislikes Pokemon, but just wants to come along to see the world) travels with him after Pikachu destroys her bicycle. Ash also meets up with his old companion, Brock, and May's younger brother, Max. Together, they travel along in Hoenn, battling Gym Leaders, entering Contests, and other events on the way to the Hoenn League.
(Source: Anime News Network)