Voxel
President of Progress City
I'm mistake Mew was found in the Green/Red japanese releases. They were the same development period. The other story is that mew was created to have hype of an invisible character within the game that would spread hype and keep the game alive.My understanding was Mewtwo was always cannon and always 150 on the pokemon list, mew was the oddity coming in a 151. In fact he was not designed by the development team but added as a prank by a developer during the development of Red and Blue (which are the American Releases, the original releases we Green and Red in Japan two years prior), Mew was added after the debuging and testing (or atleast that is how the story goes).