Originally Posted by Fat Magcargo 2
Heatmor has a better movepool, ranging from giga drain to superpower. Heatmor is not a bad pokemon, which is why it should go up to D-rank (if the list is updated). I explained that in an earlier post.
And if you recall, I corrected it for you.
Heatmor is a bad pokemon, it has mediocre bulk, mediocre speed. Onix with eviolite, for instance, is in terms of the defense stat only a better (or just below) physical wall than alomomola. Kinda like Heatmor, it has decent attacking stats but nothing else.
Heatmor has a better movepool you say? Well Furret has a pretty damn good movepool too, should Furret be E? Personally I would use Furret over Heatmor if I HAD to choose.