Diancie possesses a Mega Evolution. Mega Diancie wears a much longer white cloak; attached to its cloak are long white streamer-like ribbons with small pink diamonds dangling from the ends. Mega Diancie's crystal headdress becomes distinctly larger and more extravagant, and the large diamond atop its head changes its shape from round to slightly heart-shaped. The underside of Mega Diancie's body resembles a great crystal chandelier, composed of many large pink diamond crystals. 