MasterShotgun
brazen editing lynx
After looking at the full list of Pokemon included the base game, I don't think there will be any significant DLC. The game looks like it already covers all of the major bases. All of the starters + their final evolution, mega evolutions, legendaries, and various popular Pokemon seem to be included. I'd love to be wrong on this and have the full roster available, but I'm personally not going to count on it.