Thanks for letting me know! Ever since PokeCheck went down, I don't have a reliable hack-checking system other than my own knowledge and the hack-check thread. I really appreciate it. Let me know what set you end up using!
Oh okay now we're talking! Well, Natural Cure is a better ability on Altaria, but Altaria's useless without being Mega anyway, so it doesn't really matter that much. Yes, I would trade the Manaphy for that Swablu!
Depends on which one you want. I have a non-shiny Naive one with average IVs that I'll trade for something as simple as a BP item or a few Apricorn ball females, and I have a 6IV shiny Timid one that I only have a few clones of that will be very expensive, such as a high-IV/good nature shiny, or good nature/high IV legend or something similar that's more difficult to get.