I can't get over how much Heatran slots in between Dragons and Fairies.
Defensively, it resists every attack type you'd throw at a pure Fairy and everything you'd throw at a pure Dragon.
Offensively, it can hit both Fairies and Steels SE with STAB attacks.
Steels, in general, are huge winners because they remain supreme defensive pivots while suddenly gaining a compelling reason to use their STABs.
But Heatran seems to have it all because of resisting Fairy, hitting both Steel and Fairy, while having the bonus of a Fire immunity.
We're never going to get rid of its ugly mug I tell you! :lol