As in other regions, the Kanto region holds a number of Gyms located throughout the area. In the Generation I games and their remakes there are a total of eight Gyms. In the Pokémon Anime, the main character Ash, battled at eight Gyms as well. However, as seen with several characters' Badges, there were other unidentified Gyms that were not shown.
Pewter City Gym
The Pewter gym (Japanese: ニビジム Nibi Gym) is a pokémon gym in the Kanto region. It is located in Pewter City and the Leader is Brock. He is a user of Rock-type Pokémon.
Cerulean City Gym
The Cerulean gym (Japanese: ニビジムム Hanada Gym) is a pokémon gym in the Kanto region. It is located in Cerulean City and the leader is Misty. She is an user of Water-type Pokémon.
Vermilion City Gym
The Vermilion gym (Japanese: クチバジム Kuchiba Gym) is a pokémon gym in the Kanto region. It is located in Vermilion City and the Leader is Lt.Surge. He is an user of Electric-type Pokémon.
Celadon City Gym
The Celadon gym is located in Celadon City. The leader is Erika and she gives the Rainbow Badge.