You go back to the Survival Area and go to his grandfather's house (the house on the left of the Pokémon Centre) and speak to him, then to Buck. Buck will then leave the house. When you go back to Stark Mountain, and into the room the Magma Stone was in, there will be Heatran in it's place, ready to be caught. Best of luck.
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it will be the female Pokemon
its magma stone and its in stark mountain after you beat the game
pokemon that have the abiliti magma armor cammerupt,sluga,and macargo or ar code for quick egg hatch
After you beat the Pokemon league then you beat the volcano after that you just train forever!!!!!!!!!!!!
Nothing, you just can't catch him.