Buying Pokemon & Pokemon Items

[Lephixia]

Hello there!

I have somehow managed to amass all the legendaries.
Well.
Almost all of them.
I am currently only missing.

Yveltal.

And Im really looking to get my hands on him!
Please, if you can help let me know what you want for him! <3

And in regards to Items.
I somehow lost my Blazikenite. q.q
I dont know what I did too it.
But its gone. And Im really kinda sad about it >.<

So on the list of items I am looking for;

Blazikenite
Mega Mewtwo Y Stone
Mega Charizard Y Stone

Thank you so much if you can help!
Thank you! <3