I would always run 1 Shiny Duskull, and the rest be Reaper CLoth, because auto evolving is, at many times, much more amazing than the attack options that the shiny gives. Furthermore, due to having 80 HP, 1 retreat cost, and an attack for one energy, I would never use a Dusclops that isn't the good one from SF.
When it comes to Dusknoir, always use three, obviously to fit in the Dusknoir LvX. Now, no matter what other Dusknoir combination you may want to use, I would always throw in a DP Dusknoir, as catching an off guard opponent wins games single handedly. In my opinion, the foil rare Dusknoir from SF >>> than all the rest. Attacking for two energy is a must in this format. A MUST! The other Dusknoir's can't do that. Furthermore this Dusknoir can get free prizes KOing basics that are used to stall into getting three energy on one poke. There's also his additional draw method that both aids set-up and fuels his two energy attack.