Pokemon Red and Blue: Unlocking Mew
There was a rumor about getting Togepi somewhere in the Safari Zone. There was one about pushing a truck to find Mew. Another tale told of a glitch that made it possible to get Mew, which actually turned out to be true. Having been burnt multiple times by these hoaxes, I didn’t even attempt to uncover that secret in Pokemon Red and Blue.
Other myths circled around ways of discovering PokeGods. The particular iteration I heard involved beating the Elite Four an obscene amount of times. I did so, and my game glitched when I checked how many times I defeated them. There were no PokeGods, though.