He is in the seafoam islands.
he is at the sea form islands
Cinnabar Island Blaine was always 7th guy
It is in Mahogany town in the southwestern corner of the town.
The answer is simple: defeat the 7th gym leader. That would be Blaine, who is found in the Seafoam Islands. Defeat him to gain access to the 8th.
a city
mahogany town it is an ice gym or if you mean in kanto it seafoam island and it blanie fire type gym
It is up the ladder in the first cave you see on the Seafoam Islands. West of Cinnabar Island.
the seventh gym leader is in the island where articuno was in and still is
In Viridian City. Blue is the gym leader and you'll find him lingering on Cinnibar island. You will be able to battle him after collecting all your other badges and talking to him there.
To Blackthorn City.
Yes, after you beat the 7th gym leader.
In celadon city ^Technically, that is true for the first generation of Gold, Crystal, and Silver. But in heart gold and soul silver, the fourth gym leader in Kanto is Misty (cascade badge) if she is not in her gym in Cerulean City, then you can find her up on Route 25. ~Kt