The 7th gym leader in fire red is Blaine in Cinnabar Island.To unlock The gym, u must go 2 the pokemon mansion,search the gym key in the basement.
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The gym leader after Misty is Lt. Surge. He is the gym leader of Vermilion City, specializing in Electric-type Pokemon.
Fly to pallet town and go south eventually you will reach cinnibar island on the island is a mansion go in and find the secret key and when you do unlock the gym and go in and beat the 7th gym leader.
pryce the ice type gym leader
The only way you can unlock it is if you find the key from the mansion on Cinnebar Island