Solid framerate and moar 3D please.

From X and Y, a very solid story, more memorable tracks, and perhaps a new and interesting gimmick in the battle system.

All I want is for it to be a one year generation.

a decent post game
an actual good frame rate especially since the new 3DS exist.
pokemon follow you around
being able to revisit Kalos after beating the main region
bring back character customization and make it more extensive.

I just wish the design of the new pokemons leans more to the "badass looking" than to the "cute and charming" that it usually does. And no dumb designs, like the Vanillite or Garbador family. Seriously.

Also, give everyone a Megaevolution or just erase the feature altogether. No middle ground here.

Pokemon that follow you around.
A story like BW or B2W2
Easy/Medium/Hard difficulty levels, so everyone can enjoy it.
Character customization!

More rematches with random NPC's...
Instead of having two sucky rivals (Shauna and Serena), one sucky rival and one good rival...
A better post game than XY...
More megas...
More pokes...
More than eight gyms...
More ghost and ice types...
I liked how all the starters in XY had secondary types, but I wish they brought balance to the weakness of their primary types instead of further throwing things out of balance (meaning that a grass/dark, fire/psychic, and water/fighting setup for the starters would be more interesting)...

More regular evolutions for old Pokemon rather than giving them Mega Evolutions.

Solrock and Lunatone mega evolutions

Other: To commemorate Iwata, I think there should be an old region as well as a new region in the game. Preferably Kanto or Jhoto. It is the game's 20th so, I would like to see Kanto return as a bonus 8 gyms with updates to technology and landscape.