Something I've noticed...I scanned them in the fourth time, and all of them had the Armory Shield equipped so I could have them work in the armory. I scanned Lucina last...and what I noticed was that she was in both armories...Dawn AND Dusk, in Revelations. Secondly, after multiple battles, the Amiibo never showed up again, in the armory or otherwise. And then I tried rescanning them in...at least, Marth. By this point, I had removed the accessory, and he was working another shop. It seems that the Amiibo only work in a shop ONCE after you've scanned them in, and, in order to get them to start working again, you need to re-scan that Amiibo. Does anyone else know if this is the case?