Aurumoth, the Seraph pokemon
Black: In the daytime, it forms a cocoon out of its solid gold wings. It comes out after sunset to bring nightmares to immoral people.
White: It can measure the greediness of anyone who looks at its wings. It allows only the pure of heart to collect the valuable golden powder it leaves behind.
Black 2 / White 2: It leaves a trail of golden powder wherever it flies. A powerful illusion causes greedy people to see it as gray dust.