What Happens If I Breed Pokemon Very Closely Related In The Same Egg Group?

Question

So I decided to stop using the All sorts of breeding methods just to try this egg group one. I've never done it before and I wanna know how this will turn out before I actually invest int it.My friend has done it a couple of times and he's gotten shinnies way faster then any other methods.

Answer 1

Nothing should really happen, at least nothing is written anywhere about it. The chances are supposed to be the same I'm pretty sure. Your friend is either very lucky or he was using the Masuda method. You probably know what that is but in case you don't and are interested check out this Masuda method guide.

Hope I helped.