Actually I do have Mew & Celebi on my Stadium II but the battery has died on all my Gen II carts.
This past february, when the Gen I VC re releases came out, nostalgia hit me hard, so I unburied all my Gen I & II games from the storage, motivated by the idea of transfering my 15+ years beloved pokemon to Sun & Moon, however to my unplesant surprise, my GSC games lost the saves I had on them because their battery had died. This promted me to verify if I had some clones of the pokemon on my stadium carts. Not all of them were there, but the lengendaries, shinnies and some of my competitive pokemon were stored, along side the Mew and Celebi I got from the promotions of a specialized magazine (Club Nintendo) here on México .
However I've got a couple of things to tell you:
Firstly, I have absolutley no way to dump this saves. I've read about the everdrive method and some other hardware that uses the printer ports on old PCs, but first I have to change the battery of Gold, Silver or Crystal, right? Or is there a way to dump the Stadium II save and then extract the pokemon data?
Secondly, back on those days the use of the GameShark and similar cheating devices was running rampant in here, and even though I went to the offices of said magazine to get the pokemon and the claims of the magazine of being "the official mexican magazine sponsored and certified by nintendo", I always feared that the Mew and Celebi weren't legit, specially because both of them were leveled and had some TM moves on them, as if the guy who was distributing them was also playng with them, or worse: they weren't legit.
So, how can I know their legitimacy? Is there a list of OT & ID# of legitimate Mews & Celebis I could check before spending on harware?