It's in Celadon City and you obtain the Rainbow Badge.
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you go to the 4th gym leader. her name is erika. her strongest Pokemon is a level 29 viloplume.
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.
Vermilion city
No, sorry!
get the 4th gym badge and then give him a pokemon... get the 4th gym badge and then give him a pokemon...