Hi there, I am currently trying to breed a 5iv dratini with marvel scale (HA) and adamant nature in Pokemon X. Imaginative, I know, but I've just picked up a 3ds system for the first time ever. I currently have two dratinis in the day care, one male and one female. They both have their hidden ability (marvel scale), and both have adamant nature, and between them have the 5ivs I would like. The male is holding on to a destiny knot, while the female is holding on to an everstone.
Now, it is my understanding that 80% of eggs should have the same ability as their mother. However, I'm finding that only about 1/4 to 1/3 of my hatches have the same ability, with 19 of 25 getting shed skin, despite neither parent having it.
Am I doing something wrong? or am I just getting seriously unlucky?