Yeah, I just came back from the Mew Download, too. I got three, a Jolly Mew, Mild Mew, and Lonely. So, I'm pretty content. I asked the woman there if she had any Blue Mews. I even looked on her Game Boy! But, she didn't. Well, at least I got a Jolly Mew, which is a great nature for it. I've already thought of a moveset for it.
Anyways, I don't believe I'll be shiny hunting for the rest of the day. On FR, I'm trying to get as far as possible, and I'm not even playing Ruby right now. On Emerald, I'll probably just mass clone some random pokemon to get lots of Master Balls.