not necessarily just for the next wii pokemon game (though i'd like a full rpg, with a stadium/battle place somewhere in the region)but, here's some features I'd like introduced into a Pokemon game:
-farming.
i like harvest moon, but honestly, it gets a little old, and a lot of it would be better suited as side extra features for pokemon. You could grow berries on your own piece of land, instead of having to use the little berry areas. and it would be awesome to keep some mareep that you could sheer for wool, miltank for milking, maybe you could ride around on your ponyta/rapidash (or any pokemon suitable for riding).
-character customization.
I'd really like to choose what my character looks like. also, with all the extra money you get in the pokemon games, you could spend some of it on clothes or hair cuts. or you could even use our mareep's wool and make your own clothes/accessories.
-pokemon leauge reformation.
I'd like to have the option to do the badges in any order i choose, see, you still have to get 8 badges to get into pokemon league, but you could have maybe... i dunno, a lot more gyms to choose from. but each badge you get would be a certain level, and the next gym leader would use higher level pokemon accordingly. and then there would be tournaments in pokemon league with tons of trainors, and the elite 4 would be there for any trainer with 8 badges to challenge still.
-Socializing.
like in harvest moon, where the more you hang out with a person/give them stuff, the more they like you/and are open with you. It gets old in harvest moon, but would be a great feature to add to pokemon. and if there maybe make wifi work the the pokemon league/staduim sort of area, and there you could interact with trainers all over the world.
-pokemon as pets.
it would be nice if your pokemon were like electronic pets (like nintendogs), where you could play with them, walk around with them, dress em up, give them face paint, whatever.
-variation in pokemon.
it would be nice if each pokemon maybe had ...5 different color variations, nothing huge, just a little different tones or maybe they could have stripes instead of spots.
-Throw your pokeball with the wii-mote:
i dunno if you could do this in battle revolution (i've never played it) but it would be awesome to aim and throw the pokeball with the wiimote
-fish with the wiimote.
just like in zelda, fishing with the wiimote for POKEMON, would be awesome.
-use your own pokemon in minigames.
you would have to provide your own pokemon for mini games(/contests?). so the way you raise it, will determine a lot about how it will perform. and i guess mini games could only have pokemon of close levels then to make it fair. (somebody in a racing game is gonna be a lot better if they're 50 levels above you)
I guess what I'd like are things that are the main focus of simulation games (harvest moon, animal crossing, nintendogs, sims etc) that i think get old after a while, to become side features of pokemon games.