The eighth gym leader is Claire in Blackthorn City
8th Gym Leader: Claire8th GYM Leader is Claire of Blackthorn City. She uses dragon Pokemon. Yes indeed Claire is the 8th gym leader in gold/silver/crystal and she uses dragon type Pokemon just like lance
To get in the 8th gym you have to go find the gym leader in the light house.
in sunnyshore
The gym leader is Giovanni, leader of Team Rocket. You have to come back to Virdian last as he is the Eighth gym leader. THE LAST ONE!
The eighth gym leader is in Viridian City. It is the team rocket's leader!
in the begging of the game theres a gym near pallet town that's where Giovanni is the last gym leader
it depends............................WHICH GAME??!!??!!
At burned tower
The 8th gym leader is in Viridian City.
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
Defeat the eighth gym leader.
The eighth Gym Leader, Juan, can be found in the Sootopolis City Gym after you have dealt with Teams Aqua and Magma. He trains Water-type Pokémon.