I've come to hate breeding 1/8 female HA special ball Pokemon with the slowest hatch rate (especially with egg moves; I shudder to even consider doing it with hidden power). Recently, I was just trying to get some slow-hatching female, HA, dream ball offspring to hatch, and it took me multiple boxes to get a single one. And that was just setting up the breeding, before I really got into improving the IVs. It didn't sound that bad, but there's something about needing more than one level 3 hatching power for a batch of eggs that drives me nuts.
I also find it exhausting to intentionally hatch shinies, and I haven't really wanted to tackle hidden power too much, either. Pokemon that have to hold special items (e.g., light ball for volt tackle Pichu) sound bad too, as you either lock in the nature or 5 IVs from the parents (and in the case of Pichu, you have to make it happy and evolve it between rounds of replacing the parent).