Episode 187
Ash and friends finally arrive at the Battle Pyramid. Ash has a training match against Nurse Joy and Chansey which he loses. He then trades Aipom for Torkoal and faces off against Brandon and his Registeel.
Aired 03/08/2006EP 187 - Episode 187
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)