first it's not your rival and second the gym leader blue can be found on cinnabar island if you have all the other badges talk to him.
4th gym in Ecruteak city...Go to burned tower, fight your rival and awaken the legendary beasts. Then Morty will return to the gym.
there is no 16th gym in soulsilver u dope....
no
You'll be introduced to him or her.
Yes.
beat the 8th gym
it is a ghost type gym
In the goldenrod gym.
The third gym leader is Whitney.
In HeartGold and SoulSilver Versions, Blue is Red's rival, and the gym leader of Viridian City. You can only battle him when you obtain all of the Kanto badges, he is found on Cinnabar Island.
there are two regions meaning to last gym leaders.in the second region it will be blue or if u played Pokemon fire red your rival who then became a gym leader because Giovanni was takin out of business.the first region or johto region is a dragon type gym leader and i forgot her name.
The final gym is the Viridian City Gym. Blue is the Gym leader.