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i don't have heart gold i have pearl but what i do know is you just have to get on you tube

its at the seafoam islands...just go left of cinnabar go in the island and go down the ladder and that's the gym
It depends which gyms you've beaten. If you're going in order, then the 15th gym is at the

Seafoam Islands.

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11y ago

What else can I help you with?