After u beat the first 7 u will go back to pallet town and then go to viridian and the gym that was earlier locked is now open (Giovanni is the boss)
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In the 8th gym. he is the gym leader
The 7th gym leader in Pokemon yellow is in Cinnebar Island, which is south of Pallet Town. You need a Pokemon with Surf to get there.
You battle the 8th gym leader, Clair, at 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
In Pokémon Yellow, the 8th Gym Leader, the Viridian City Gym Leader, Giovanni's Pokémon are Persian, Dugtrio, Nidoqueen, Rhydon and Nidoking. Persian is at Level 53, Dugtrio at Level 50, Nidoqueen at Level 53, Nidoking at Level 55 and Rhydon at Level 55.