-adventure in a rural / perhaps fantasy pokemon land
-Not completely isolated like Breath of the Wild, lets have some villages maybe even a port city or something.
-Make it an emotional story. Is it a crime to want a pokemon story to make me cry / touch my heart? For this, i think the game would have to be rated T. Let me see some one loose a loved one or loose all hope. Let me see them come back fucking strong.
- focus on nature and scenery along with exploration. Think Xenoblade Chronicles X world.
https://www.youtube.com/watch?v=e1gHJbCc_xE-good voice acting
-you dont need new pokemon. You dont even need ALL the pokemon. A partial Dex is FINE if the game is good enough to warrant it.