Blackthorn city, in kanto you find him at cinnibar island show him your 7 kanto badges to make him go back to the gym then you can battle him.
cindber island
In Blckthorn City
Yes.
you go to blackthorn city to fight the 8th gym leader
beat the 8th gym leader and then talk to to professor elm :)
beat the other 7 gyms in kanto and talk to the 8th gym leader on cinnabar island. he will leave and go back to the gym
Gary isnt a gym leader
The ice gym leader
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
no
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
In the original Pokemon Silver you had to beat the 8th gym leader, Claire, then she allowed you to pass.