I've only found one seed that I can abuse easily, and that's the seed my Monozu come from. I'm now using to breed Quint Burungeru but my frame's changed(it does that with different parents it seems) so I'm now breeding new parents.
I've also noticed that the everstone has some effect besides helping with the nature, I think it might be forcing the parent to always be parent A, because I got the same results with the same parents with one holding everstone after entering them in the daycare in reverse order...