You can't be a gym leader in any of the pokemon games, you can jusr beat them and earn the badges you need to complete the elite 4
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
in his gym
claire
the 16th gym leader is:Trainer Blue
get a Pokemon with a ressisstance
He is on Cinnabarr Island.
go to the Pokemon gym
The first Gym Leader who is Falkner, the Violet City Gym Leader, he has a Pidgey and a Pidgeotto.
The Gym and Gym leader is in the bottom left of the city near the Pokemon center.
Blue, the last gym leader in kanto region
Ghost Pokemon.
you dont