Well after you defeat 15 gym leaders in Pokemon HeartGold / SoulSilver go to Cinnabar Island and talk to Blue.
After beating the 16th Gym leader, you can Catch Mewtwo, and then just train for Red.
After defeating the 5th gym leader (Norman) in Flora Sky, the next goal is to get to the 6th gym leader. Go to maulville city and go to the right of the city.
Seafoam Islands austinb. here u have to go to cinnabar island talk to blain there then surf to the right u will find an island with a girl in front u want to battle the girl no other way in, then u go in and go up the latter
go to the light house in sunny shore the gym leader is there. Then go to the gym once youve talked to him.
Giovani left his gym to join Team Rocket as their leader. you must beat cinnabar gym then he will be there.
after you get all 15 badges go to cinnabar island and there will be the 16th gym leader after you talk to him go to the virdian city gym and he will be there
the 16th gym leader is:Trainer Blue
You have to defeat the other 15 gym leaders, and then talk to Blue (the 16th gym leader) on Cinnabar Island. He will go to Viridian City once you show him the 7 Kanto badges you have obtained.
The 16th gyme leader is first on cinnibar island talk to him to make him go back to the viridian city gym.
The 16th gym leader is Blue. You can only fight him after you win all 15 gym badges. after you get all 15, go to cinnabar island, blue will be there. show him your badges and he will return to the gym so you can fight him
First find the gym leader on cinnibar island then go to viridian city you can now enter the gym.
the 16 leader is in virdinian city after beating every other gym leader
You must talk to Trainer Blue (Gary) on Cinnabar Island. He will then leave, and you may now go to the 16th gym and battle the gym leader.
Sabrina
yes, and you have to battle her to get your 16th gym badge
After beating the 16th Gym leader, you can Catch Mewtwo, and then just train for Red.
After you defeat Blue (the 16th Gym Leader), go out of his gym then, Prof. Oak will call you. Then, go to his lab talk to him and he will tell you that he can make an exception for you to go to Mt. Silver. And now, you can go there.