If by any chance you don't want anymore or have an extra breed of it just please compromise: Xerneas, Jirachi, Shaymin Darkrai, Arceus, Regigigas, Dialga or Kyurem... It's really hard to attain these Pokemon now and days.
I have a few of those in gen 6 that I can import and clone for trading, although I will warn you that they likely have awful IVs, and many have uneditable nicknames. I forget the exact list, but I'll edit this or reply again once I'm home and have access to them.
Worth noting that none of these Pokémon can be bred, however. You probably aren't going to find an uncloned gen 7 version of any legendaries these days.