I know it was "getto daze" in japan; but making everything available ultimately was a huge mistake.

It vastly limited the scope of the world and what pokemon could be!

>could have still had talking mons in game and outside if it was specified if some weren't meant to be capture.
>could have had a living region or something of that nature
>train/car/bus pokemon
>leaders of certain species
>various things around for the sake of the ecosystem

>Inb4 some zooming little shit says, "Oh there is something cool I can't get, I hate that"
Sure, but it would remove many unwanted mons lik route one shitters, unown,Luvdisc, etc. They can be mentioned or just be NPCs in the field. No point having them around if that's the case, Stadium taught me that as a kid.

On the other end of the spectrum there should be final bosses or crazy enemies
>Lusamine,
>giant robots

With a smaller selection and some things only being enemies, the graphics would have improved tenfold.

>Puzzle league/LoZ quality in gen 1 +2
>Mystery dungeon or Ranger quality in gen 3
instead of shitty static sprites
etc....
Having so many pokemon about (which are mostly useless) only hindered the series.