1. More cross-generational evolution lines! I would just love knowing that I have to EV-train again one of my Pokémon because it now has a new evo.
2. Ghost and Steel-type Eevelutions. I have been waiting for them for about 8 years.
3. Dark-type Gym. I agree with all of you people!
4. More post-Elite-4 stuff.
5. Have you ever thought about real-worrld-like environment? I mean that every place in the region should be able to have every weather condition. And this should be based on time. For example: in Hiun City, on July, it could be raining on some days, but snowing on December. That would be awesome!
6. Continuing my speech about weather. I would like more weather conditions, such as Thunderstorms, Wind, etc.
7. Day-based evolution. Like, a Pokémon only being able to evolve on Mondays.
8. I know it's kinda obvious that it's gonna happen, but still I'm gonna put it: more Poké Ball types.
9. Since the characters are older: CAR!!!!!
10. Expanded Fly feature.
11. Ever played Chrono Trigger? Well, I would love to see Anime-like cinemas, simillar to Chrono Trigger.
12. Pokéathlon-like stuff.
13. At least 150 new Pokémon! We're running out of Pokémon!!!
I think that's the end of it. =)