Quoted By:
A focus on exploration. Make it so the region is huge and filled with little secrets, and hide rare and strong Pokémon in there.
They should also ditch the whole "evil team" storyline, or make it have lower stakes (like in the Johto games). The world has been about to end for like six or seven times already. GameFreak just sucks in making interesting plots, their strong suit is environmental storytelling. I want more of that: interesting places like the the Ruins of Alph, the Abandoned Ship or the Abyssal Ruins. Those places were really cool to explore.
More sidequests would be nice, the series is really missing that. I remember SM had a small bunch of sidequests, and I liked them, they were nice.
They should also put more effort in making the region feel alive. Nowadays they just feel like souless theme parks, but it wasn't always like that. I want more pointless stuff, like the PokéGear in GSC. There really wasn't a point in making it, but those radio programs really made Kanto and Johto feel alive. More lore and worldbuilding in general would be nice.
Other side stuff like the Battle Frontier or Contests would be cool as well. I want to do more stuff with my Pokémon than just battling.
also add a dating sim but only with your pokémon