I found a weird thing. I don't know if it's a bug or if it'd intended behavior, so I thought I'd bring it up.
I set my partner be Alolan Vulpix. I started the game with the difficulty on "difficult." Their abilities are Snow Cloak and Cute Charm. I was looking for a more casual experience, so I swapped the difficult to vanilla after a while, and their cute charm ability swapped to snow warning, but it only shows up in dungeons. Going back to "difficult" difficulty fixes it.
I don't really want endless hail in my game, so unless there's a workaround or fix I missed while searching this thread I guess I"m stuck playing on difficult.