What you do is talk to the person in Castilia City and get the Zoura pokedex entry. Then, like other people said, you go to the GTS and look for a Zoura/Zoroark.
Or you wait till you battle someone with a Zoura/Zoroark(which I can almost promise is near the end of the game) and then go to the GTS and look for zoura/zoroark.
I did this myself and got a lv.64 zoroark and now 5 zoura eggs. Believe me-I know!