>>13502233But wait. If Durant eventually evolved it's steel plating, then it gained it's Steel subtype, turning from what it originally was, Bug, to Bug/Steel.
If so, why didn't Heatmor? If Heatmor changed to kill Durant easier, then shouldn't it be Normal/Fire, or X/Fire?
Face it, Heatmor was always Fire Type, Durants are just stupid and doomed to extinction.