This is an instructional video of how to catch Mew, in infamous 151st Pokemon in the original Red and Blue versions, without the use of a cheating device, and on the first trip to Cerulean City!
Just to clarify some of the questions that people are having:
1. For those of you who are having trouble battling the Slowpoke Trainer (game freezes) make sure he is walking up to you and you are not just walking in front of him.
2. Yes, this was done on a Pokemon Blue ROM. Not Yellow, not Red. The reason the colors are what they are is because the emulator I used to play it was a GameBoy Color emulator and for some reason the emulator put colors which are not the same when you play the game with an actual GameBoy Color.
3. This apparently works on Pokemon Yellow, according to some users. While I personally have not tried this glitch with Yellow Version, other users say that it works so I should clarify here that it does.
4. No, this does not work in Fire Red and Leaf Green. If you had half a brain cell this would be obvious to you.
PLEASE DO NOT MESSAGE ME WITH QUERIES REGARDING DOWNLOADING AN EMULATOR. THEY ARE ILLEGAL. Besides, a simple Google search should suffice =D