What would you think of inorganic Pokemon in the same vein as Chandelure, Chimecho, and Magneton that are prehistoric and have experienced extinction? I know there's already Pokemon that are based on relics, like Claydol, Sigilyph, and Unown. I'm talking ones that leave behind a fossil and need to be re-animated, just like Aerodactyl, Archeops, Armaldo etc.
Some examples would be Pokemon that are based on weapons or items that were used billions of years ago, or even outdated items that have been mostly made "extinct" by new inventions(ex: a record player being replaced by a CD player)(Just an example).
Should there be pre-historic non-animal species as well?