From Bulbapedia, the community-driven Pokémon encyclopedia.
Sable City (Japanese: サビシティ Sabi City) is a small anime-exclusive town located in Kanto, very close to Pewter City.
In The Ole' Berate and Switch!, Sable City held a one-day Pokémon Tournament, in which Ash entered to train for his upcoming battle with Pyramid King Brandon. Ash participated with his Corphish, who helped him win against Howie and Oriba. However, Max accidentally discovered that Team Rocket's Butch and Cassidy had created the event as a scheme to steal all the competitors' Pokémon and give them to the Boss. Ash and his friends joined forces with the other Trainers to defeat the plot, while the Team Rocket trio helped and decided to get their revenge on rivals Butch and Cassidy.
Pokémon seen in Sable City