Pokémon : S5 | E19 – Extreme Pokémon!

Continuing through a winding valley, Ash notices a small town up ahead. Brock reads his guidebook and declares that it is the township of Eggseter. Suddenly Gary on a pulled skateboard by his Arcanine passes by. Ash calls out to his rival and challenges him to a battle. Gary, however, declines. He explains that he and Arcanine are entering the Extreme Pokémon Race before rushing off to continue his training. Ash and his friends give chase, and watch in amazement as other Trainers also practice.

Later, the group stops off in a restaurant. Misty notices that Ash is still not satisfied, and he admits that he is worried about the collar around Arcanine's neck. A man, Mr. Shellby, overhears the conversation and explains that Extreme Pokémon is a popular sport. With the mention of competition, Ash is determined to beat Gary in the upcoming Extreme Pokémon competition. Mr. Shellby offers to assist. During a Tauros cart ride, Mr. Shellby explains that he operates a local Pokémon Day Care Center, responsible for raising young Pokémon from Eggs. The group soon arrives at Mr. Shellby's home and meets his wife Kimie. The group looks around the home and see shelves full of Pokémon Eggs, and they also meet some of the new hatchlings. Mr. Shellby shows Ash to his old skateboard and lends it to him for the upcoming race. Ash rides down the sloping hills on the property and admits that he used to mountainboard back in Pallet Town.
(Source: Bulbapedia)