So my question is this, I understand that the Masuda Method is having a foreign Pokemon breed with.yours in order to increase the chance of the baby being shiny. If I have two Pokemon from outside my native country, like say one from Japan and one from Germany while I'm in Canada and I breed them will this increase the chances of the baby being shiny even further?
No, it doesn't stack the chance. Only one foreign Pokemon can increase the chances.
It should be noted that having two foreign Pokemon from the same country would produce the same results as having two Pokemon from one's own country. -Madradlilypad