You find Heatran in the third room at the end of Stark Mountain, which is available after you beat the Elite Four.
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The only way to obtain a Heatran in Pokemon Heart Gold/Soul Silver is to trade it.
the trainer that has bagon in platinum is at the cave where u find heatran the old man near the entrance to heatran has it
Nothing evolves into heatran, heatran does not evolve!
To find or catch Heatran, you need to have already finished the Stark Mountain quest which is available after you defeated the Sinnoh Elite Four and got the National Pokedex. Where Charon and the Team Galactic Grunts were captured by Looker and the International Police, Heatran will be there. Heatran will be level 50 and have he following moves: Metal Sound Crunch Scary Face Lava Plume
No, Heatran does NOT evolve.