Of course you can't! It's only available in the 4th Gen Pokemon games.
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You can't.Sorry, you can't you can't even transfer it. When they made Emerald Heatran wasn't in excistance. You'll have to go to stark mountain on Pokemon pearl or diamond. Sorry.
Nothing evolves into heatran, heatran does not evolve!
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