[XY] Question.

[Black Waterfall]

As far as I know, you only need to have parents from games in different languages. So a male English Eevee and a female Italian Ditto could work, for example. The parents don't have to be shiny Pokemon themselves.

You can double-check the mechanics here:

https://bulbapedia.bulbagarden.net/wiki/Masuda_method

Good luck! 

PS: It is easier to succeed if you have a Shiny Charm