WHHHGAAAAAAA........
*Sven's Mindnuked*
Okay, okay
*Gathers himself and collective thoughts together*
So the gist of this is that Unknown are the only actual "Pokemon". And that they have the ability that allows the to create the physical manifestation of a person's dreams/ideal reality and with that it led to the creation of pokemon. So, it allows must me that there are or must be ruins builted in honor of the unknown. The thing is that when looking into the entire pokemon universe and what not. Drayden mentions been around even before pokeballs were built. So pokemon must've existed tens of thousands if not millions of years ago, unless someone wanted the animals that went extinct to be brought back as pokemon fossils (Aerodactyl, Archeops, & Bastidon). This in a sense can explains why a pokemon like Spiritomb & Shedinja exist since Spiritomb is just a collection of evil human souls and Shedinja is just an old cicada exoskeleton. It also explains to an extent why gender exclusive pokemon like Kangaskhan, Chansey, Hitmonlee, Hitmonchan and Jynx exist, also along with the later sets of regional pokemon.