Its a method to get shiny Pokemon. When used, the chances of breeding one are in the 1/2000s instead of 1/8000 something.
- Gain any Pokemon thats from a different country than any other you have
- Like usually, put the two in the daycare and gain the egg.
- Once it hatches, it's unlikely to work. So if it doesnt, do it again.
- I you want a shiny badly, repeat this process until you get one.
Hope I helped.