Article: Then go up when you get off the boat. You can get to Stark Mountain from there.     Go back to the place were you found the Magma Stone and Heatran will be there.
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During your first visit to the island with the Fight, Survival, and Resort areas,you can go to by the ship at Snowpoint City. See a guy called Buck, battle him, and then go straight north, until you see the cave. Save the game first here. Then go through the maze inside, and let Buck take the Magma Stone. Go back to survival area and go in the house closest to route 225. Talk to Buck and he will put the magma stone back.