lilharper
it has been proven by the pokemon people themselves that if you breed a pokemon from japan with a non japanese one it doubles or quadruples the chance of a shiney from .01 percent to like .1 percent or so ive heard
It doesn't necessarily have to be Japanese. Just one from a language that isn't the same as your game's. And it quadruples the chances from about 1 in 8000 to about 1 in 2000.