Don't listen to that spammer. Anyway, a classic pokemon glitch, the MissingNo glitch. You will need the Game boy version of Blue to do this glitch.Here's the breakdown for you. All you will need is a Pokemon with Fly and one with Surf.
1) Talk to the Old Man in Viridian City, let him show you how to catch a Weedle.
2) Fly to Cinnabar Island.
3) Surf on the eastern coast of the island, so you are on half-land and half-water. You will eventually encounter a MissingNo. or other high level Pokemon based on the letters in your name.
Do not catch it. If you do, it will mess up your game completely.
If you want to see how to get MissingNo with your own eyes, then click on this:
http://www.youtube.com/watch?v=-tOyBahKkbkEnjoy!
