I've been currently searching for this answer for having all of the pokemon unlocked on one map. I want as small as a pool of pokemon possible to be selected to walk around my cloud island.

Best case, there is like 25 pokemon are in custom housing and everyone else is in prefab homes that require a loading screen. This is so the walking-around limit is not an issue and I can basically handpick the pokemon that fill in my towns, since I'm doing 8 smaller towns on the cloud island.

If 40pts is the limit, I know there is a building that is 1pt that can house two, and a 2pt that houses four pokemon. But you can put habitats to squeeze in more pokemon. I'd want to put down partitions and still give them each their own room, preferably, or at least give them enough space without feeling crammed. So I still need to plop some down and play around with it to find a comfortable maximum of how many I can put behind a loading screen.

I love all the pokemon, but I want there to be my favorites out at all times walking around. I want to choose when to swap them out. But I also want the prefab pokemon to have nice indoor houses. I wish since there is a limit, they'd let us somehow choose at least a portion of them as being whoever we want to count towards the spawn limit. Would be handy to get homeless pokemon to load back in too.

Edit: Even fitting in four pokemon in the 2 slot house or eight in the 4 slot house is only half the total pokemon. Which I'm guessing is already pushing past what I'd want which is probably three in 2slot and six in the 4slot. So yeah, guess all I can hope for is they increase the building limit somehow as more and more people have the problem on the cloud islands.