If you haven't found answers to your questions yet, I have asked some people, so I should get a reply shortly.
From my experience, I think they are okay to wifi battle. I personally would not bring them to a VGC event, they sometimes are strict. I guess putting them on a trade thread is okay, although you should specify which ones are achieved that way.
Thanks for the post, you reminded me. :)
I can get a regenerator solosis, eventually. Although I can trade you a magic guard flawless one in the next couple of days. The regen one will take significantly longer. You choose. :)