Deino in Pokemon X and Y?

Question

I already know where to find Hydreigon and Zweilous in Pokemon X and Y.
Where would I find Deino, is he even catchable in X and Y before aftergame?

Answer 1

You can get Deino by breeding a a Zweilous or Hydreigon. Either breed a Female Hydreigon Zweilous with a Male Pokemon in it's egg group (own species works) or breed either gender with a Ditto.

So yes, it is obtainable before post-game, but not catchable.