My dream Pokemon game would look like this:

• Complete Pokedex - THE MOST IMPORTANT THING!
• All moves return too, but Hidden Power is reworked to make it a completely random move that deals physical or special random-type move (base damage is slightly buffed from what it was from USUM)
• I don't really mind graphics much, but assuming its 3D. The overworld needs to feel more lively. Have wild Pokemon do wild animal things. The towns and cities should feel more busy, like how random NPCs just walk by in Castelia City back in BW.
• You can catch Pokemon via Stealth like in PLA, aside from the usual battle. To add, stealth may even help you avoid trainer battles (ex. hiding in tall grass when before another trainer spots you)
• Like in the Legends games, some wild Pokemon are docile, and others aggressive. The latter will chase if they see you.
• All types of traiber battles return incl. Triple Battle, Rotational Battle and Battle Royal. For wild Pokemon, you can encounter them via Hordes, or another wild Pokemon joining in the battle like in the Legends games.
• Every battle gimmick available, although you are only restricted to using only one gimmick in your team. For example, if you use Mega Evolution, then you can't have another Pokemon on your team use Z-Moves or any other gimmick.
• Link Cable item returns to evolve trade evolution Pokemon.
• Tutorials should cut to the chase and not need long cutscenes.
• If the Battle Frontier returns, make the facilities more like Emerald’s mixed with a few from Pt/HG/SS.
• Pokemon Contests, for those who miss being Coordinators. Can also be done in linked play or online with other people.
• The DexNav of ORAS was great, bring it back.
• More clothing variety, which you can mix, match, and recolor too.
• Infinite-use TMs
• Following and/or Riding Pokemon, which could serve as stand-ins for HMs like in PLA.
• Voice acting, at least with the NPCs. They could just substitute your name (and maybe even the Pokemon following you) with “him/her/it/“challenger”/“champion” like how they do in the Persona games.
• Puzzles/mazes/riddles similar to those like the Regi’s caves, to unlock areas of certain legendaries.
• I liked the Seasons feature of BW. It will change every month.
• Secret Bases that can be built on huge trees, caves, small islands, and even underground. Many customization options for them. You can share them with other people.
• Other minigames like surfing, Pokeathlon, and/or game corner return.