Its giovanni.
Spoiler Alert!
You have to beat the other 7 gyms in firered then the old man guarding the 8th gym is unlocked and you may battle Giovanni
The Viridian Gym (which is the 8th). beside that, there is the Pewter Gym, found above Viridian, after the forest.
Conquer the other seven Gyms, and then you will be able to battle the Viridian Gym. Its specialty is Ground-Type Pokémon.
you have to get all of the other gym badges in kanto and then go to Cinnabarr island and talk to blue. then go to viridian city and go in the Pokemon gym!
In the beginning of the game, he isn't there. Towards the end, you will find his rival on cinnabar island by himself. After you talk to the rival, he leaves to go back to viridian. Fight the cinnabar gym leader, go back to viridian and the gym leader should be there. The man you talk to on Cinnabar Island Isn't the gym leader, but his rival. After you speak with his rival on cinnabar, the gym leader reappears in viridian. You have to fight and beat the cinnabar gym leader first.
It unlock the door to the gym in Viridian City. .
Defeat every other gym. The Viridian City gym is actually your last gym, not your first.
The Viridian Gym (which is the 8th). beside that, there is the Pewter Gym, found above Viridian, after the forest.
The 16th gym is the Viridian City Gym.
Go to viridian city and go to that gym Go to viridian city and go to that gym
Viridian gym i forgot his name the team rocket boss guy.
Conquer the other seven Gyms, and then you will be able to battle the Viridian Gym. Its specialty is Ground-Type Pokémon.
Blue, the Viridian gym leader(looks like your rival for Pokemon FireRed/LeafGreen), is on Cinnabar Island. Talk to him and he'll say a few things, then go to his gym in Viridian City.
Viridian City.
Viridian city.
Blue
He won't be in viridian at first he will be at cinnibar island if you talk to him he will go to the gym in viridian city go to viridian city to battle him.
The final gym is the Viridian City Gym. Blue is the Gym leader.