Episode 181
Ash and friends finally arrive at the Indigo Plateau for May’s Kanto Grand Festival. Before the competition, excitement already unfolds as Aipom returns and steals everybody’s hats! With that help of Drew and a new trainer named Solidad, they manage to get the hats back. After Drew leaves, Solidad tells May how she knows Drew, and how much he talks about May. While this is going on, Brock and Max run into a cloaked figure that they suspect to be Harley. As the next day begins, May, Drew, and Solidad all pull off impressive performances, but everyone begins to wonder where Harley is. All of a sudden, Harley, dressed as May and calling himself Mayley, comes out for a Harley original appeal. As the first round ends, May, Drew, Harley, and Solidad all progress, however, Harley has set out to defeat all of them!
Aired 15/06/2006EP 181 - Episode 181

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)