To me,

I love squaring off against the Elite Four, but all too often it feels like that's the end of my Pokemon journey outside of filling up the National Pokedex. While I can appreciate that there's a huge online element in each Pokemon game, I don't always feel like I'm dedicated or smart enough to actually take part--a lot of people playing Pokemon online are scarily good at Pokemon. So, really, I'd love to see more endgame content in the next game: more side quests, challenges, and objectives that help train me to be a better player and make it more likely that I'll be able to compete online. Pokemon is a far more technical game than most people give it credit for, but the main storyline rarely forces you to dabble in the minutiae of it all. The right endgame content, then, could finally make me feel like a real Pokemon master.