The first gym leader will be found in the Pewter city gym (in Pewter City of course). Viridian City also has a gym, and since it appears first you could consider him the "first gym leader". However you are unable to enter the gym until you have obtained all 7 of the other gym badges. Once all 7 of the other badges are acquired, he can be found in the gym (in Viridian).
The 7th leader is Blaine. He uses fire pokemon.
You will find it on Cannibar Island in the Pokemon Manssion. You will also need this to get into barrlines Gym (uses fire type Pokemon ). You then go to Varralium city above pallat town and the leader should have retuned. Be warrned because you will be versing Geouvouni one last time as the leader of the Gym (uses earth Pokemon).
you have to break the code
You must go to the Pokemon Gym. Beat the gym leader and he awards you with the 8th gym badge
You need the secret key found in Pokemon mansion.
you find it in the Pokemon mansion
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.
There is no gym leader called Pryce.
the fourth gym its a fire gym
You have to go into Pokemon mansion. Find the key in the basement.
The leader is Falnery, she uses fire type pokemon.
The 7th leader is Blaine. He uses fire pokemon.
The fourth gym leader is Erika, the Grass trainer.
The eighth gym leader is in Viridian City. It is the team rocket's leader!
The fourth gym at Pokemon fire red is grass type gym
the leader of team rocket
in lavaridge town