>>36940087All Pokémon have a relatively similar power level (e.g. not Ledian levels of unplayable).
A lot of post game. A battle frontier. A Pokédex of ~150 Pokémon with an opportunity to catch much more after the Elite 4. Option to battle gym leaders again. After defeating the E4 the next time you battle them their teams have improved.
A hard mode á la BW2 without having to beat the game and trade it across.
A major improvement in the 3D graphics with the jump to the Switch
Keep the feature that shows the % of Pokémon you have caught in each route so you have a good idea of when they're done (from ORAS).
An international release - everybody gets it on the same day. This should be alongside an international release of the anime instead of a ridiculous delay.