Mew is a special
Pokémon that cannot be obtained normally in the red/blue/yellow versions of the
GameBoy game. To get it, one had to visit regular "
Pokéconventions[?]" that toured the nation and hook one's game pack into a special device that would transfer over #151, Mew. Or one could use a Game Genie or other cheating device to obtain one much more easily.