First you must have all of the 15 other badges. Then go to Cinnabar Island. He will be there, near the Pokemon Center. Talk to him and he will return to the Gym in Viridian City. Then you can challenge him to a Pokemon Battle.
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
On Pokemon Soul Silver and Pokemon Heart Gold, you have to defeat the Goldenrod City Gym Leader, Whitney, and then she tells you that the construction for the Pokeathlon Dome is complete.
Ghost Pokemon.
you dont
the 15th gym leader in soul sliver is blaine and he uses only fire type pokemon
You can not. It is impossible for Heartgold and Soulsilver.
in viridian city
in his gym
Face the elite four.
Cinawood City.
Hi
don