If you were a Pokemon series' character you could patch up with Ash and his friends to get to the Cinnabar Island team leader.
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Cinnabar Island
He will appear after you beat the 7th gym leader.
He is in the cave on Seafoam Island, which is east from Cinnabar.
You will find it in the Pokemon mansion on cinnabar island.
Blaine, the gym leader of cinnabar island, gives it to you after whooping his butt.