Any idea how I can fix this problem with Home?
Wormadam just won't register, and it's stopping me getting the shiny Magearna once I finish Sword.
Things I have tried:
Putting it back into a game and then back into Home.
Moving its location from one box to another.
Trading with someone on the GTS, my Wormadam for theirs.
Deleting the app entirely.
Edit: Fixed it! The one I'd deposited from Arceus was Trash Cloak, and the one I traded for on the GTS was Sandy Cloak. Neither of those triggered. I just got a Plant Cloak from the GTS and that one did.