Stockpile makes everything better.
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Ability: White Smoke/Flash Fire
Stockpile- Boosts both defenses so now Heatmor can take hits.
Giga Drain- Heals and covers all weaknesses.
Sucker Punch/Will O' Wisp- Sucker Punch is the main reason to use Heatmor over other fire types in NU. Will O' Wisp can save you from Earthquakes and Stone Edges. Natures also change depending on which move you choose.
252 HP/128 Def/128 SDef EVs. Brave or Modest nature.