I don't know really. When generation 3 got its remakes during XY, the only connection the anime got was Steven Stone's return, and the arrival of Sawyer along with Treeko into Sceptile storyline on top of that Sceptile could achieve Mega-evolution.
Albeit XY was a series where all ties to the past got severed in favor Serena (which I thought was dumb as dumb could get, but that's a whole nother rant) and all fans got were a few easter eggs.
As for Dawn though... I definitely believe it won't be in SM, because like generation 5, in gen 7 all we got was more of the same story with big plot differences. So I doubt Dawn has a chance with Alola. Maybe next generation perhaps, we don't know if the future would have room for Dawn, but one can hope.