the 7th gym leader in on cinnabar island. if you look at you town map it is the island right below pallet town
Cinnibar island.
In the mahogany gym
The seventh gym leader is Candice, the Ice Type leader. She is at Snowpoint City.
Go to the lake of rage and either KO or catch the Red Gyardos
You go on to defeat the eight gym leader.
pryce the ice type gym leader
The 7th leader is Blaine. He uses fire pokemon.
Candice
On cinnibar island.
The eighth gym leader still awaits, as well as the whole of Kanto.
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.
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.