deoxys yesI'd actually like to know if it's possible with Rayquaza (probably goes back to the Sky Pillar if anything) & Deoxys, too. It'd certainly make SRing for them a lot less of a pain if you could go back and catch each one individually.
And on the subject of Rayquaza, 100% confirmation that Dragon Ascent can be taught to past-gen Rayquaza would be nice, too. I only see people assuming that's the case.