As usual, the new Dex seems kind of light. Some new forms exclusive to a DLC area would be nice. Galarian Slowbro/Slowking were so nuts that it’d be great to get something like that again. Maybe a time distortion area that lets you get Hisuin Pokemon in the wild? Move Tutors would be welcome, especially for those moves that got culled, like Scald, Knock Off, and Roost. I think they should bring back some of the moves they removed, like Signal Beam, Refresh, and Tail Glow. Magnemite feels incomplete without Magnet Bomb and Mirror Shot.
Most importantly, let Abilities work in the field again. Synchronize should change natures like it has in the past. Right now it’s just a nightmare trying to catch wild Poke’s with the right natures, unless you want everything to be Gentle. We had mints in Gen VIII and Synchronize still worked flawlessly.