I would like the dark grass and phenomena, and phenomena for dark grass, maybe some Pokémon in the phenomena can run of you if you go too fast, and move to other tiles. A new Pokémon World Tournament. Pokémon Following or areas where Pokémon can get out of it's Pokéball... Come on, GameFreak, you do all gen 1-7 animations, and you use the same exact 3d models! Even LGPE models looks better.
I want to see a Post-Game where you explore a new part of the region, that was entirely unaccesible before, like in BW2 or in LGFR, I also want to go in new islands to follow a Roaming Flying Legendary/Mythical, Mythical/Legendary and even pseudo-legendary events, like go with 2 specific Pokémon at specific places in your party like in RSE to catching the Regis, or braile, follow a specific vibration via switch control to find out where to dig/dive for finding them... A new mechanic that allows us to use dig in some places to go underground, and the dive system... I want back almost everything that was introduced in Gen 5,3 and 7, like Pokéstar studios, Contest, Pokérides, Dunsparce evolution...