If your running a game than that is entirely up to you. However, I am 99% sure that they have not been published as Open Game Content, so Paizo would be unable to use them.
Su-monsters do have a historical basis, so there's nothing (theoretically) stopping Paizo from publishing their own take on them. That said, they haven't yet.
What the hell is a 'su monster'?
One of the psionic creatures from 1st edition AD&D, along with the brain mole, the cerebral virus, and a few others. I believe it's in the Expanded Psionics Handbook for 3rd, which should work pretty well...
Oddly enough, the su-monster isn't in the XPH; the su-monster was skipped over for 3rd ed.
The Dungeons & Dragons monster has a bit of history behind it.
The succarath, sometimes called a su-monster, isn't much like the D&D version.
Huh. Well, should have checked. Thanks.
Just because it Can be used, doesn't mean it Has been imported my good fellow. Since the Su Monster is a psionic creature, and paizo has not yet released a Psionic system(Psychic Magic by all accounts), it really isn't a surprise that it has not seen print yet.
I don't think it's in Dreamscarred's Psionics bestiary either, though I don't have that (is it even out?).
I thought these were the only creatures that could not be used
beholder
gauth
carrion crawler
displacer beast
githyanki
githzerai
kuo-toa
mind flayer
slaad
umber hulk
yuan-ti
From the 3.x Monster Manual. Not from all of the other sources of monsters that were published for D&D, either 3.x or other editions. A goodly number of classics (and less-than-classics) made it in through a special agreement to publish the Tome of Horrors, which is why Pathfinder has decapus and flumphs and Orcus as a fat guy with a ram's head and a bunch of others. But it's not infinite. No "yugoloths", for example, and they only got a few of the classic (1e) daemons.
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Based on the su-monster out of the 2E Monstrous Manual it wouldn't be difficult to make stats for them in Pathfinder since they are essentially just apes with some psionics. The psionics component can be easily translated to a handful of mind-effecting spell-like abilities.
It wouldn't be difficult, no, but we wouldn't do it. If we do a su-monster, it'd be based on the folklore version of it, and that means no psioncis/psychic power, since that version of the su-monster is not open content.