Simply go east from Ecruteak City
there is no 16th gym in soulsilver u dope....
You CAN NOT become a Gym Leader in Pokemon HeartGold and SoulSilver or ANY MAIN SERIES POKEMON GAME.
i haht Pokemon soulsilver so live with it itiet
his gym
beat the 8th gym
it is a ghost type gym
In the goldenrod gym.
the next gym is @ Mahogany Town
Olivine city
Go in the gym.
beat gym leader
Brock.