Cheat for Pokemon Blue

Okay, this cheat can be applied to both Pokemon Red and Blue (not sure about Yellow).

HOW TO GET ANY POKEMON YOU LIKE TO APPEAR AT A CATCHABLE LEVEL

Well, the old way of getting a Mew using glitches is flying from the gambler trainer near Lavender Town, just as he sees you, fly to cerulean city and defeating the slowpoke kid, then flying to Lavender town and Mew will appear as you walk west towards Saffron.

Well, I experimented with this little glitch and I've realised you can have any Pokemon you like using this glitch! This is my simpler method of catching a Mew, or any other pokemon.

First,go to cerulean city with a Pokemon who knows fly or teleport in your team (abras in the area are good). Then, walk up nugget bridge until you reach a small area to the left of the screen you'd usually surf down to Mewtwos cave. There should be a trainer in the grass here. Stand in front of him, but have the trainer just off screen.

Take one step towards him and immediately press start, and use a Pokemon to fly away or teleport. If done correctly, the "!" sign will appear over the trainers head, but you will fly away. Now, the start button should not work. This is normal. Go defeat a trainer of your choice in the area, and then return to cerulean Pokemon centre using teleport or fly.

Finally, walk back upwards to nugget bridge. At the foot of the bridge, the start button should pop up. Press B and a battle will start, and depending on what trainer you picked a Pokemon will appear.

(for those looking for a Mew, use the Slowpoke kid on the way to Bills house or the Swimmer in Mistys gym, these two will get you a Mew).

However, by using different trainers after running from the trainer in the grass, you can battle any pokemon. I have encountered wild Pinsirs, Magmars, Gengars, Lapras, Nidoqueens, Staryus, and Rhyhorns, so experiment a bit and you may end up with a really rare encounter (wild dragonite, anyone?)

If you need more help, we've got more Pokemon Blue cheats and also check out all of the answers for this game