Pokemon wants to reel in old fans. They release RBY on the 3DS. Old guys, and gals may pick up their 3DS and play them. Then think what has happened to pokemon since then? Well we got XY, and ORAS that are out now with Z possibly on the horizon. To hold you over we got Pokken Tournament with Mewtwo, and Charizard for you.
Game Freak is a business, so don't expect them to put in non-bankable pokemon into Pokken Tournament. Every pokemon on the list besides Braixan is a fan favorite, or appeals to nostalgia. Your Haryiama who might be the best choice for this game isn't as well known as Machamp, or Lucario. You can't expect Game Freak to go extreme on such a risky move. I think that if this game is competitively viable I could imagine getting a bunch of DLC characters.
I also want to know more about Pokemon Go! It seems like an interesting idea that went dark all of a sudden.