Yeah, I don't think they're in danger in there. This world seems very dedicated to learning and understanding Pokemon, so I can't imagine they'd make people store their Pokemon any place that's bad for them.

I wonder if part of it might be to allow people to bond with their Pokemon. It can be a bit difficult to really get to know your team if you have too many of them to attend to at once.

[ Not for her, since she's surrounded by Pokemon a lot of the time anyway. But not everyone is able to do handle that many creatures at once. ]