Most ground-type attacks are enough to cause heatran to faint since its Fire and steel. Like other rare Pokemon, Heatran has great base stats that make damaging it very difficult. Watch out for stat-reducing movesp; Heatran likes to follow them up with strong attacks once you're weak. If you caught Cresselia, then its mist will be very handy with Heatran since it prevents stat reduction to any one on your team.
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Nothing evolves into heatran, heatran does not evolve!
No, Heatran does NOT evolve.
What do you do after you battle heatran?
if you faint Heatran then you're out of luck with catching it in your game since you usually only get 1 chance to catch a legendary provided you didn't save the game beforehand. Save The Pokemon Ds Game Perl/Diamond in front of evry Leganry Pokemon (Recommed)
aggron is weaker than heatran by a mile simply because heatran is a legendary Pokemon