to get to the 7th gym go to the safari zone and find the secret house go inside and get the hm surf also find gold teeth and go to warden slowpoke's house give him the gold teeth he will give you strength the you go to pallet town and surf down to cinnabar island then you get the key to the gym in the pokemon mansion
and go in to blain's gym (he has fire type.)Tip:Use water or ground type.
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You have to find the key in the abandoned mansion.
its actually the 8th gym so you need 7 badges and then it will unlock
I think the gym in fuschia city
In Pokemon FireRed and LeafGreen you can't open a gym.
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.