Episode 153
On the way to the Battle Dome, Ash and the others decide to stop at a famous fishing spot for the day. However, the lake is deserted. They find out from the owner of a fishing house, Tiffany, that a company wants to buy the lake and turn the land into a resort. In order to scare people away from the land so Tifanny and her Grandma get no business, the leader of the comapny uses his Crawdaunt to terrorize the lake. When Tiffany fins out, she challenges his to a battle. The next day Ash prepares to fight him for the future of the lake.
Aired 17/11/2005EP 153 - Episode 153
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)