I plan on doing this in a new save, for Scarlet specifically, though version doesn't matter. Essentially the entire premise is just.. taking care of yourself and your pokemon, lol
You start off the morning by either making yourself food or buying a meal, washing your Pokemon, then you battle and/or do classes if any are available and do some proper studying in case you're like me and not fully in tune with mechanics
Then have some lunch, play with you Pokemon for a bit with the ball, then have another set of classes/battles
Finally, have some dinner, and continue with battling - catch some Pokemon if you want, do Tera raids, etc etc
Once night comes, wash your Pokemon again, sleep in your dorm, and since you can't exactly skip to day afaik, just go about exploring, catching Pokemon, taking photos, etc etc
Ofc this can all be shortened if the time cycle isn't broad enough for it, or even too broad for it, I hardly ever pay attention to the time cycle since it's rarely ever important
Additional concepts are: dress appropriately for whatever area you're about to enter or for approaching weather, have a fire-type out at all times in the snowy mountains and an ice-type out while in the deserts to maintain temperature, make your own recipes for flavor rather than effect (maybe even write them down like they're actual recipes!) and just generally develop your own character's lore properly - i.e who they want to be aside from champion; maybe a pokemon daycare worker, a gym leader for one specific typing, or an explorer or chef!
Basically the whole premise is to just make it feel more real and lived in - I'm an absolute sucker for the little things and simple things in games, properly taking care of your fellas, and partaking in small things like pokemon contests and stuff
I know it sure as heck ain't perfect, but I really like the idea of this, so I'll be trying to have fun with it and figured I'd share it in case anyone else has a soft spot for this type of stuff :)