>>55373108Don't see it as a species, but as a position or title, they are the heralds of Ho-Oh and possibly Ho-Oh has had several throughout history. Every time Ho-Oh brings a Pokemon back to life they acquire these characteristics, something similar to Ghost Rider, a Green Lantern, or even a Power Ranger, regardless of their species they just inherited the title.
Or are they just gay zombie animals and let's call it a day