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I got mine in LeafGreen. The actual ad said you could only bring one game, so I brought LG at the time to get it on there. (that awful feel when I walked out and saw kids with DS systems trying to get theirs lel)
I ended up trading it to Emerald and cloning the shit out of it, making copies for all my Gen 3 games. I then sent it up to Diamond, and a copy to Platinum, SoulSilver, White and White 2.
In fact, the Mew has been on my Post-E4 team in every single generation since I got it. It's got the same moveset that a Mew my friend traded me as a kid had, and I intend to trade one back to him when Bank opens up.
I'll probably bring 6 of em up, one for me, one for him, one for another friend, one for gts trades for Xerenas and I'll probably have the other 2 up on Wonder Trade.