Set the minimum to 650 and the maximum at 721 and hit generate.
Go to the X/Y pokedex (opens in new window) and find your spirit Pokemon using the Kalos pokedex.
*If your Pokemon is capable of a mega evolution hit generate again. If it’s an even number your spirit Pokemon is the mega form.
I got Heliolisk which was fitting for me. What did you get?
FAIRY POKEMON SPOILER
Meet Diancie - Fairy/Rock - A member of the new trio.