Because shiny parents do not increase the chances of hatching shinies. You would just need a foreign Ditto to improve your chances. It doesn't matter if the Ditto is shiny or not. --- STOP CALLING ME HOME ROWED shut up before i make you shut up
A shiny Ditto doesn't help to get shiny Pokémon from the daycare.
A Ditto from a different language game (not just a different country) is what activates the Masuda Method --- 3DS FC Ares 3738 0446 1787 <> Black 2 FC Enyalio 0562 4621 2772 DW Collection: http://tinyurl.com/3qz7odk