I'm pretty sure he's on Cinnabar Island. You need to get HM Surf from the Safari Zone, then sail south from Pallet Town. Eventually you'll get to the island. Then you'll need to complete a "dungeon" to get the key to the gym. The leader is fire-themed.
The 7th gym leader in Pokemon yellow is in Cinnebar Island, which is south of Pallet Town. You need a Pokemon with Surf to get there.
Candice
snowpoint city
Cinnabar Island
It is in Viridian City. After you have beten the 7th gym leader it is open
The 7th gym leader in Pokemon yellow is in Cinnebar Island, which is south of Pallet Town. You need a Pokemon with Surf to get there.
The 7th gym leader is Blaine. He the gym leader of Cinnabar Island gym. He uses Fire type Pokemon and he will give you the TM that contains Fire Blast when you defeat him.
Brock is the first gym leader in pewter city.
Giovanni
The 7th leader is Blaine. He uses fire pokemon.
celadon city
i cant explain
The gym leader of Mahogany Town. He uses Ice-type Pokemon. You face him as the 7th gym leader in the game.
His Pokemon are: Vanillish,Cryogonal,And Beartic.
In the town where Ltg. Serge is a gym leader there is an officer there with a squirtle. Beat the gym leader and talk to her afterwards.
Candice
snowpoint city