I know about that, I mean like its an additional thing that, you know, makes it awesome.Wish granted.
Hoenn starters (obviously), Johto starters after Delta Episode, Unova starters after 2nd challenge through the Elite Four, and Sinnoh starters after 3rd challenge through Elite Four. No Kalos or Kanto starters because, well, XY has them. Sadly no HA, at least I don't think, never got a clear yes/no. However Cosplay Pikachu can have its HA so who knows.
And if they do add HA's, well thats six entire pokemon families taken off the "umreleased HA list"