Pokémon S01 E08 The Path to the Pokémon League

"Gotta catch 'em all!"

On the way to Vermillion City, Ash meets AJ, a Gym Leader at an unsanctioned Gym who has 98 wins and zero losses. They battle, and Ash is surprised that AJ's Ground-type Sandshrew can easily beat his Flying-type Pokémon.