Episode 149
During a training match against Ash's Grovyle, Brock's Mudkip evolves into Marshtomp and with its new power injures a nearby Flaaffy. They offer to help Flaaffy, but it turns out the girl, Mariah, has a Grandma that owns a pharmacy nearby. At the pharmacy, Flaaffy is healed. Ash and the others then learn that Grandma Katie has a student named McCauley that is learning the secrets behind medicine. Meanwhile, Team Rocket decides to steal all of Katie's medicine.
Aired 20/10/2005EP 149 - Episode 149
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)