So I was breeding Gastly the other night with a 31/31/x/31/31/31 and a x/31/31/31/31/31. After a bunch of failures to get 31/x/31/31/31/31, within a set of 5 eggs I ended up with a male 31/31/31/31/31/31 AND a female 31/31/31/31/31/31. My mind sort of boggled thinking how crazy lucky I was... napkin math says the odds of any individual egg being 6IV even with 5IV parents having the IVs you were looking for is 1/192 (1/6 for the Destiny Knot stat being right, 1/32 for the random stat), so two in five would be, what, 1/7300ish?
I decided I might as well breed a bunch of 5IV Gastly from my perfect breeding pair so I set them up in the daycare and started hatching. About the 3rd batch I got my first 31/x/31/31/31/31. Then about the 5th batch I got ANOTHER male and female 31/31/31/31/31/31, in the same batch, right beside each other in my party.
At this point I can't believe that I hit the most useless lottery-like odds of all time. What is up with the RNG here? Is there something about breeding and IVs that I'm not understanding? I haven't done a ton of breeding in XY yet but breeding up a few other things I never saw anything weird like this. Is it something to do with Gastly or is this really just dumb RNG luck of the highest order?