The 8th gym leader is in Viridian City.
The eighth gym leader is there so you will have to defeat all the others first.
in the begging of the game theres a gym near pallet town that's where Giovanni is the last gym leader
The fifth Gym Leader in Pokemon LeafGreen is Koga, the leader of Fuschia City's Gym. He specializes in Poison-type Pokemon and hands out the Soul Badge.
the 8th gym leader is Giovanni and u can only battle him after u beat blaine and go to one island wif bill
The eighth gym leader is in Viridian City. It is the team rocket's leader!
The 8th gym leader is Drayden he uses Dragon type pokemon
Defeat the eighth gym leader.
volkner
Wassilij
The 8th gym leader is in sunny shore city
Step on the portals until you get to the gym leader.
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.