Article: One Island only unlocks once you defeat the Cinnabar Island gym. You can get to the island by boarding a ship. You'll need HM03 Surf.  north to the sandy beach. Continue heading north through the tall grass to another sandy area. Keep walking north until you see a cave opening. You'll see "Ember Spa" in the upper left corner of your screen. Follow the path north, then climb a set of stairs, then head east to a man between two waterfalls. He'll give you "HM06 Rock Smash". "Rock Smash" will smash small crumbling boulders in your way.
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Go to One Island. Go to the east end of the island on Kindle Road. Surf Enter the cave. Talk to the man.