Blackthorn
if you are including Kanto its Viridian
Pokegamer01
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
in viridian city
Cinawood City.
Viridian city
The last gym is in viridian city
Morty is the Gym Leader of the Ecruteak City Pokemon Gym.
Defeat the viridian city gym leader Blue.
you go to blackthorn city to fight the 8th gym leader
The Gym and Gym leader is in the bottom left of the city near the Pokemon center.
The first Gym Leader who is Falkner, the Violet City Gym Leader, he has a Pidgey and a Pidgeotto.
blackhorn city i think its next to mahogany town
Blackthorn City, after Mahogany Town and after Ice Path