"In earliest recorded history, Pokémon and humans are referred to as separate tribes. Humans are the only mammal on Earth, whereas every Pokémon capable of breeding that we know of lays eggs. We don't have Moves, nor Abilities. You also can't catch another human in a Pokéball to make them your pal. Furthermore, in the oldest known myth--the Original Story--humans aren't mentioned once. However we came to be in this world, we were not created by Arceus... One theory suggests that we came from outer space!"

Said theory had been posted 10 years ago on 4chansey.org by an anonymous user, and had since circulated the internet almost as much as a certain excerpt about Vaporeon.