here's mine:
* the ability to get mega stones from X/Y and OR/AS
* the return of the PWT from black 2/white 2
* make the game progression balance in difficulty
* more legendary pokemon
* the return of the battle frontier.
* the ability to catch xerneas and yveltal in the post game.
And most importantly:
* fix the GTS
What would be the point of "the ability to get mega stones from x/y and ORas" exactly? ORAS ALREADY has the ability to get stones from X and Y (it's called trading, lol!) the SOLE reason you can't do it in reverse is because certain mega stones didn't exist in X and Y so those particular stones can't be traded back to X and Y, but any stone that exists in X and Y CAN be traded from ORAS back into X and Y, so your statement doesn't make any sense. Secondly, EVERY mega stone is already available in every copy of OR and AS, so why would it matter whether you can get stones from X/Y (which you in fact already can) when every single stone is already in ORAS?
They've already given you literally every single legendary possible between XY/OR/AS except for the Event pokemon (of which they have changed Deoxys from an event to an in game pokemon now) how many more legendaries do you need when we literally have all of them?
Catching Xerneas and Yveltal will likely be a given considering they've done that in every other third version game (except Black 2 and White 2)
And this is directed at more than one poster, but I'm honestly so sick of people complaining about the GTS. Who are you to decide what value I should place on my pokemon? Why does it anger you what other people do and don't want? I had a glut of legendary beast trio pokemon, so who are you to decide that I am or am not allowed to trade it for a shiny Zigzagoon, or a Scyther with Defog or something? Why shouldn't I be allowed to trade a pokemon I have extra of for something other people consider trash? It's MY pokemon so I should be allowed to trade it for whatever I want. If someone wants to post a zigzagoon on the GTS asking for an Arceus, then let them. Not only is it not up to you to determine what other people are and are not allowed to do on a public site, but you can actually change the settings in the search so you don't see people asking for special pokemon, or so you only see people asking for pokemon you specifically have in your PC boxes and boom! problem solved. They give you the tools to filter right in the search section, I don't know why they need to further stamp down on users by making a series of tiers, relative values and arbitrary values of pokemon based on certain other pokemon. When Pokebank came out in Japan but not in North America a few unreleased pokemon were released into the GTS, I grabbed some (a Piplup and a Slakoth) and because most people in the world were not able to obtain them, I was able to breed these unobtainable pokemon to put on the GTS and literally ask for absolutely every other kind of unobtainable and legendary pokemon. Who are you to determine that I wasn't allowed to put up a Cottonee and ask for an Entei? No one outside of Japan had a Cottonee at the time because it wasn't available in X or Y at all. If someone doesn't want to trade me for it, they don't have to.
Now on a side note, never actually LOOK for pokemon on the GTS. The correct way to get what you want is to DEPOSIT a pokemon you already have and post what you want, then you'll get it.
Now, rant aside, back to the original topic:
What I would like to see:
A way to level DOWN your pokemon. Lots of times I get a pokemon I really like and once it levels up to a certain point it's no longer useable in other games (level too high to obey the new trainer, or simply too high and it decimates everything with no trouble at all, etc) or also because of so many legendaries being given away at level 70, 80, 100, whatever, it would be nice to bring them down to a much lower level to play through the games again with.
A way on wifi battles to back out of a match up before it starts up. I'm getting tired of constantly running into Talonflame, Gengar, and all legendary teams, and while I could just shut off the wifi (although I hear that can't be done on the New 3DS) it counts as a loss for me if I happen to do Ratings battles and disconnect even if it's before the match starts.
More diverse move tutors. I'd like to get more types of moves for the pokemon. Dedenne with Draining Kiss, or Greninja with Thunderbolt or Flamethrower, Regirock with Dynamic Punch again (it was in Emerald), stuff like that.
The gen 4 pokeballs back so there are more variety of Pokeballs to use (if you breed, you know the data for the old gen 4 balls are still in the game, so why not just make them available again?)
More quests to do stuff and obtain the rare items. There's these ancient mirrors that allow you to change the forms of Thundurus, Tornadus and Landorus but instead of going into some deep dark dungeon and fighting battles to find it, you literally just go to the mall to pick them up (That's not even an exaggeration. If you haven't played ORAS, the mirrors are literally just at a store in the mall (New Mauville, to be exact))
And finally, have it on the Wii U! I have wanted to see these Cell Shaded 3D pokemon on the big screen for over two years now! at LEAST release a Pokemon Colosseum/Stadium/BAttle Revolution type game where you can at least battle on the home console.