I would guess that Nintendo wrote into the code that the game would erase after a set period of time so that you couldn't pass it to all your friends. But that's only a guess.
data can get corrupted in many ways, the game could have been dropped it could have been near a strong magneticsource, it could even have been a glitch or even a faulty battery. sram is not a very secure way of saving data so many things can go wrong.
but it wasn't an evil conspiracy, just faulty technology.
That seems thoroughly unlikely, especially since it took three months. If that was really the case there would have been a horrible, contagious epidemic of Pokemon carts dying all across the nation!
There is of course a well-established way now for anyone to catch Mew without a cheat device or risking corruption of one's save data.
"There is much pleasure to be gained from useless knowledge." --Bertrand Russel (attributed)
http://www.ocf.berkeley.edu/~jdonald...mewglitch.html
You have to restart the game though.
Actually, there is another way to get a Mew, but it's only for Diamond/Pearl/Platinum, and it was intentional, unlike the aforementioned glitch.
You need to own My Pokémon Ranch. Upload 999 Pokémon, then the ranch proprietor, Hayley, will have a Mew. If you bring her an egg (doesn't matter what's in it), she will offer to trade her Mew for the egg. You can then withdraw the Pokémon for usage in your game.
As for the glitch above, I can certainly vouch that it works. I have one Mew from Pokémon Blue currently in Pokémon Silver.
Good question... I have no idea, I've been bringing random Pokemon in with the ones she wants, but she's getting uncomfortably close to asking for Lugia.
Serving the retrogaming community since March 2005
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can be found here: http://www.digitpress.com/forum/showthread.php?t=66092
There are also ways to get mew from events in the US and Japan that are on GBA games. I have a few different mews.
To get the 999 pokemon for ranch you should either buy an action replay or a ds flash cart. Then download a program called pokesav and you can make any pokemon you want with any stats. You can also use a code that lets you clone pokemon.