I remember reading once, (back when I first got the internet) that if you do something (incredibly difficult and time consuming), then you go to the truck by the St.Anne (What's with that thing anyway? Lots of 'cheats' around it, and whats its real purpose?)
Use stregth, or something (possibly the previously mentioned Golem comment. And under it will be a single plant! Cut it, and one of those holes from like, seafoam island is there. Go in there, and your at the base of a volcano! (ooooooo! Ahhhh!) Make your way up the volcano, (fighting several trainers with lv.50~ pkmn) and at the top, it will start erupting! But first, and Egg flys you! It then erupts, and you are thrown to the vermillian pokemon center. And the egg hatchs after 100 steps, into lv.5 togepi.
I started trying to do this (back then, what, i was a nieve kid!) but gave up after a short time thinking "Oh well, never liked togepi that much anyway." LOL.
There was also a cheat I told my friend, (after reading it on the internet mind you!) That if you go to the St.Anne, and surf around it, you can cut into it at a place. You'll have to fight Gary (Or red, or blue, or whatever) and after you beat him, you can fight/catch mew! I did try this one, but I don't think i did it right, but I'm pretty sure it wouldn't work x_X