Hello. Some time ago I've battled with my Zacian against Mustard's Gigantamax Urshifu and it acquired a memory PKHex thinks is illegal for some reason. I've attached a .pk8 showing the problem. Zacian becomes legal If you change a Pokemon in the memory. Is this a bug noone reported before?
888 - Zacian - FD638B7755AE.pk8