The Viridian City Gym is closed until you defeat all other 15 Gym Leaders. After you've acquired 15 badges, go to Cinnabar island and talk to Blue, he'll acknowledge you and his Gym will be open.
the 16th gym leader is:Trainer Blue
Viridian city
there is no 16th gym in soulsilver u dope....
yes, but first you have to beat blue (16th gym leader) and then you can find him in mt. silver cave
its in viridain city in the kanto region. you will fight gary. (hes not the last boss, red is!)
Sabrina
The 5th Gym is in Cianwood City in Pokemon Silver, Gold, and Crystal.
go to that island that had a volano eruption and talk to the guy there once you have 7 badges and he will go to the gym.then you go there.
The 16th gym leader is Blue, then after that, you get the EARTH BADGE, and get a TM from him after, then you are able to use HM08. After you go to Mt. Silver, your going to fight Red, who is similar to Ash, his Pokemon are lv. 80-90. Blue is in Vermillion City in Kanto, the gym that is empty is where he is.
In the gym!
in his gym
claire