Personally I would love to see 16 badges (Gold/Silver) or a new game plus to be added.
I know this won't happen, but I would like to have a choice to either join with the bad guys or good guys, have more than 1 save, maybe 3 save slots, and I would love to make really hard decisions that will affect the game play (if new game plus was introduce this would be awesome to have)
You know what I'd love? Routes that are randomly generated and changing every day. Like the Black Tower/White Treehollow, but a full on route instead of just a bunch of rooms.
One of the simply joys of Pokemon to me is exploring the routes. Seeing everything there is to see, battling all the trainers, finding every item. I never liked how after the Elite 4, all of that just ends and you're stuck in the regional Battle Tower for the rest of the game.
A massive frickin' Battle Frontier. With 700+ Pokémon it will be glorious.
This. And if we can't get this, bring back the Battle Tower. The Battle Subway was gimmicky, but someone recently said that they saw a train station somewhere on Kalos' map. I hope that wasn't the Battle Subway.
The Official Bulbasaur of Pokemon X's board Bowser Jr, T Zelda, Ridley, Palutena, Pittoo, Isaac, Shulk, Mewtwo, Robin, Balloon Fight, Crono, Mii, Megaman, Neku