Where can I find the diancite?

Question

I have diancie from x in oras but I want to mega evolve it. Where can I find the mega stone

Answer 1

You must trade it to ORAS then some people will ambush you, and someone will give it to you. Enter into the nearest Pokemon Center and they will stop you.

Hope I Helped!

Answer 2

Mega Diancie does not exist in XY. To mega-evolve your Diancie, you need to trade it to Omega Ruby/Alpha Sapphire.

Put it in your party and enter/reenter the nearest Pokemon Center. It will trigger an event where two men will speak about wanting your Diancie, then a boy will enter and give you the Diancite.