After the mess in your trade shop, I have vindicated the Diancie as real. Feel free to link to the pictures I have taken should anyone ever question it, and go ahead and put it back in your shop if you haven't already. :)
(I'm not a mod.; just wanted to get the proof up there.)
EDIT: Post was considered off-topic despite that I was trying to prove the validity of your Pokémon. I won't aim to say that's right or wrong, but instead link you to the pictures I took proving its legitimacy. Here you are.
http://oi58.tinypic.com/4gkebq.jpg
http://oi62.tinypic.com/2u7bvqc.jpg
(I'm not a mod.; just wanted to get the proof up there.)
EDIT: Post was considered off-topic despite that I was trying to prove the validity of your Pokémon. I won't aim to say that's right or wrong, but instead link you to the pictures I took proving its legitimacy. Here you are.
http://oi58.tinypic.com/4gkebq.jpg
http://oi62.tinypic.com/2u7bvqc.jpg