I don't know if this is the right area for this so yeah.
I'v been playing the games since Red/blue were released in NZ and while I always have and still do love the games, some things rub me the wrong way or jsut don't agree with me.
These are my personally thoughts for the Pokémon games and I expect people to disagree and have their own ideas.
1. Longer games.
I would love to see them bring back the ability to travel to a different region after the league. Since SS & HG brought this back I was disappointed when B/W removed this feature. Now I know that there are four main regions and more sub regions that are seen in the anime and side games.
For me I would love the ability to visit travel the entire Pokémon world as we know it within a single game and compete in all the different leagues including ones like the Orange league, etc.
2. Different battle types.
While having double and triple battles is nice and all for the everyday trainer you fight along the way, I would like to see a mix up in things to happen.
For example: During Ash’s travels in the Orange Islands, the gym battles there weren’t just standard Pokémon fight.
Now I don’t know how hard it would be to balance and implement something like this into the game, but for me I would love to see some unique battle types that spiced up the run of the mill turn based ones we have atm.
3. Side Quests.
I toughly enjoy side quest in games, when they help flesh out the world, history of the world and people that live within it.
Now things like the Unknown quest in HG/SS were a pain in the ass and time consuming. With the end prize feeling underwhelming once actually obtained.
If they add small quest like taking items to someone in a different region so you are encouraged to visit different places that aren’t normally on the beaten track with rewards that fit the task or something.
4. Pokémon Contests.
Actually doing something with this.
5. Fun Side games.
Not the pointless block making.
Something like the Pokéathlon in HG/SS can’t remember if it appeared in BW.
but include things like Trainer & Pokémon contest, like the Pokémon Race in Joto or the water sled race seen in the Pokémon Hero’s Latias/Latios movie
6. New Pokémon Not New Forms.
I don’t like them. They seem half assed and to me it seems like there running out of new ideas.
I would rather see new Pokémon, or if they can’t think of any, Use that time and energy to work on some other element of the game.