Some asian guy kept asking to trade with me and showing me his collection like Yveltal, Xerneas, etc. I have nothing so I'd just put up my lv. 8 Dunsparce. He'd decline and after a few minutes ask to trade again.

Finally he accepted the trade for the dunsparce, he gave me an EGG. It's a complete and utter mystery. It's not one of them "glitch eggs" I've heard about, is it?