Get Mew
From Glitches
From the games Pokemon Red/Blue and Pokemon Yellow for the Game Boy
For the longest time, pokemon gamers have been trying to get Mew. Now, you can get him! Unfortunately, you can not be done with the game to do this.
You must do this glitch before you get fairly far in the game... you have to basically be at Cerulean city. Go onto Nugget Bridge, and defeat all the trainers except for the trainer in the grass to the left of the bridge. Also, you can't have fought anyone in Misty's Gym yet. If you don't already have one, catch an Abra (I think they should be in the grass by the trainer you have to leave alone) and keep him in your group. Go directly above the trainer in the grass, while he's off screen. Slowly step towards the trainer, and right when you can see him, hit start. Save before you try this, because if you can't hit start before he sees you, then the glitch won't work. Using your Abra, teleport back to Cerulean City. The trainer should notice you and stop you, but then you'll teleport away from him. Go to Misty's Gym and fight the first trainer. Now, go back to the Nugget Bridge. The start menu should pop up for no reason. Push B and you'll fight Mew! You can save at any point during this whole glitch.
But wait - you can still catch another Mew! Clear a way to the kid with a Slowpoke facing up, but don't fight him. Repeat the teleport thing with the trainer in the grass to the left of the bridge, but this time make your way to the kid. IMPORTANT - he must walk to you, so go to the top before going in front of him. Go back to Cerulean City after the battle, and in the same spot as before, the second Mew will appear. It may be possible to catch other rare pokemon, such as one-time-only pokemon with this glitch.
Submitted by: AndyDark
You can view a Youtube video of a variation of this glitch here.

