OH. MY. GOD.
I just hatched a Modest female Piplup O_O
It took me by surprise too... I was just cleaning out my PC box and getting rid of pokemon I don't need/want, and there was like 8 eggs left over from Piplup breeding. Since I couldn't release them I decided to hatch them and then release them. Then on like the 3rd last one it hatches and out comes a Modest female O_O
I guess four hours pays off.... eventually xDD