To Blackthorn City.
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Go to the Radio Tower in Goldenrod City.
he is at the sea form islands
The answer is simple: defeat the 7th gym leader. That would be Blaine, who is found in the Seafoam Islands. Defeat him to gain access to the 8th.
You go south of pallet town there should be a little island where cinnabar island was. The 8th gym leader should be there but he won't battle you.You need the 7th gym badge to battle him.The 7th gym is near the island.Beat the 7th gym leader.Talk to the 8th gym leader again and he's going to go back to the gym to what for you there in Viridian City.
by BEATING the 7th gym