Help LF Advanced Breeding Advice

[Dragonstrike]

Genderless pokemon are hellish to breed if you aren't fortunate enough to have a 5-6 IV Duplicat.  Or 4 IV even.  Heck, let's even say 3.  Because 2 or less, and your odds of breeding 5 IV versions of those genderless mons are abysmally low, or even impossible.

I just looked this up, and you're pretty much right. Genderless & Breedable pkmn include:
Astronite
Chainite
Gargryph
Gellin
Hazma
Neopunk/Parseopunk
S51
Tracton

Anytime you want to add an extra perfect IV, you're betting that the Destiny Knot selects the perfect IV's you already have AND that one extra random IV is a 31. The Destiny Knot chooses 5 out of the 12 combined IV's that the parents have. When the right IV's are selected, you have a 1 out of 32 chance to get an additional perfect IV. I do not know enough math to figure out the matrices for the chances for this to happen when moving from 4 IV's to 5 IV's, but I can see from here that the chances are very small.
EDIT: Fiddling around with an IV calculator: At best, you're looking at 1 out of 75 eggs. At worst, you're looking at 1 out of 786 eggs. This is when you are indiscriminately looking for any additional perfect IV. Trying to get particular IV's makes your chances even worse.

This is why I prefer not to breed genderless pokemon. Such a hassle for a group of pokemon I don't particularly care for (Besides Astronite, their awesome). Not exactly the best investment in my opinion, in my opinion mate.

Unless you happen to have those amazing Duplicat.  I'd say Tracton, Chainite, and Astronite are the ones most worth breeding from the group atm, with Tracton being highest on the list for obvious reasons.