Skeleton Summoner: Add "human skeleton" to the list of creatures you can summon with summon monster I. Once per day, when you cast summon monster, you may summon a skeletal version of one of the creatures on that spell's summoning list.
Would the summoned creature(s) also have the fiendish or celestial template in addition to the skeleton template?
Yar!
(don't mind the necro... though no one else has posted, so meh)
Unfortunately, due to the very nature of the Skeleton template, the inclusion of Fiendish or Celestial becomes moot.
A skeleton loses most special qualities of the base creature. It retains any extraordinary special qualities that improve its melee or ranged attacks.
Smite Good/Evil is classified as "supernatural", not "extraordinary", so that's gone.
Even though Alignment DR does actually improve it's melee attacks (as creatures who have DR/alignment have their melee attacks count as that alignment for overcoming DR), Alignment DR is generally thought of as supernatural as well, not "extraordinary".
As is energy resistance (not to mention that is a defense, not something that actually improves it's melee or ranged attacks, so in either light it is gone). Same with SR.
So, everything gained from the Celestial and Fiendish templates get removed by the Skeleton template anyways.
Personally, I think this is sad and unfortunate: using up a feat to remove a bunch of abilities from your summons. But alas, that is the RAW at this moment in time.
~P