Single post in All About Deltas

I haven't specifically taken data on this so still I'm leaving this in "unanswered questions", but I've tried breeding deltas with a delta ditto, and my impression is that I consistently get more normal deltas, and not deltas of the ditto's delta type. Based on this I believe a ditto parent does increase the chance of a normal delta type (have fun genderless hunters), and that a parent's non-delta type is the only type passed on to offspring.