No, Heatran does NOT evolve.
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Nothing evolves into heatran, heatran does not evolve!
Heatran is classified as a legendary Pokemon and like most legendaries it does not evolve. (exception: Phione/Manaphy, debatable)
No, the Fire Dog-like Pokémon known as Entei or the other one called Heatran cannot evolve further in Pokémon Platinum.
What do you do after you battle heatran?
aggron is weaker than heatran by a mile simply because heatran is a legendary Pokemon