Are the celestial and fiendish creatures' smites meant to be single target or not? The Paladin's smite explicitly requires a specific target to be chosen, but the creature template version doesn't, and it switches from plural "foes" to a singular "target" within the single sentence.
The creature may smite evil 1/day as a swift action (it adds its Cha bonus to attack rolls, and a damage bonus equal to its HD against evil foes; smite persists until the target is dead or the celestial creature rests).
If 'the target' isn't evil then smite does nothing but is still expended, "zero 'foes'" is correct grammar, plural is commonly used with an unknown number.
(I think - second language and all that :D )
you pick one target