The Sixth Gym leader is Chuck, he has a Hiryama and a Poliwrath.
The six gym leader location in Pokemon Heart Gold is Olivine City, but you battle the one in Cinnabar first.
The sixth gym leader is in the top of the lighthouse. She is caring for the sick Pokemon. You must go to Cianwood City, get the secretpotion, and bring it back to her. Once you do, she will return to her gym. You can battle her at that point.
sixth gym laeder
Step on the portals until you get to the gym leader.
The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
in canalava city
Ummm... Which Pokemon game?
One of your Pokemon has to learn surf.
You can only get the Sixth Badge from the Sixth gym leader. After defeating the Sixth gym leader, the gym leader will give you the Sixth Badge.
Sabrina, the psychic gym leader. She is located in Saffron City just after beating Koga, the fifth gym leader.
it is i n fortree city
In her Gym