In the glade and trail
could possibly move some to the grotto itself; I wasn't sure what to put there
I realised that I don't have polishedmap on this laptop so you'll want to move the items elsewhere
This adds the intermittent area before Brunswick Grotto, where you'll encounter Galarian Zapdos periodically.
It seems the hide/show constants are desynchronised again, as the copies in the glade won't disappear.