Yep I stand corrected, apparently Null can be. I remember about a week into when the games came out I checked serebii's page of locked shinies, and it was listed, but people must have found otherwise because it's no longer listed today. Kinda wish I had known so I could have SR one myself lol
the shiny latios will come sooner or later. It's always a downer when you have long hunts with long srs but if you keep at it eventually it'll show up and it'll be awesome to finally have it after all that hard work!
Maybe for dlc, we gotta see what's with pokemon company saying blaziken gets ice punch but it doesn't at all, I'd love to get em but I have no money to get em, I want to use my shiny beedrill as a mega ingame awhile after sceptile