Mewism Posted in M Best definition Mewism Mewism was a common belief that All PokÃÂ©mon evolved from a cosmic ancestor. dude 1: Mew is the Ancestor of All PokÃÂ©mon, All PokÃÂ©mon evolved from Mew. dude 2: That’s Mewism How satisfied are you with the definition? Looking for Mewism meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 19 times.