in viridian city
Head to Mt. Silver to battle Red.
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
Ghost Pokemon.
you dont
the 15th gym leader in soul sliver is blaine and he uses only fire type pokemon
in his gym
Face the elite four.
Cinawood City.
Hi
don
the 16th gym leader is:Trainer Blue
The sixteenth gym leader, Blue, should be in Viridan City. To get him to appear in his gym, defeat Blaine in Seafoam Islands (Cinnabar Island's volcano erupted). Then, visit Cinnabar Island to see Blue standing there. After talking to him, he should be at the gym then.