In what game? In any game but Mystery Dungeon, YOU CAN'T. Heatran is a legendary, legendaries appear ONLY ONCE. I blew my chance with Uxie. I forgot to save at the start. So the answer - Trade from someone else, Heatran's Gone!
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Nothing evolves into heatran, heatran does not evolve!
you go to stark moutain do the mission and then go back to find him or her
No, Heatran does NOT evolve.
What do you do after you battle heatran?
aggron is weaker than heatran by a mile simply because heatran is a legendary Pokemon