Breeding Rate
( % for every for every 256 steps)
>> Same species, different ID numbers
>>>The chance of getting
> an egg is 69.3% (has a value of 70). The old man in the Day Care will
> say: "The two seem to get along very well."
>
>> Same species, same ID numbers
>>> The chance of getting an egg is 49.5%
> (has a value of 50). The old man in the Day Care will say: "The two
> seem to get along."
>
>> Different species, different ID numbers:
>>>The chance of getting an egg
> is 49.5% (has a value of 50). The old man in the Day Care will say:
> "The two seem to get along."
>
>> Different species, same ID numbers:
>>>The chance of getting an egg is
> 19.8% (has a value of 20). The old man in the Day Care will say: "The two don't seem to like each other."
>
>> Different egg groups, same genders or Undiscovered group:
>>>The Pokémon
> are incompatible and therefore will not make an egg. The old man in
> the Day Care will say: "The two prefer to play with other Pokémon than
> each other."
Source: Bulbapedia
If both the Unfezent and the Noctowl were caught in YOUR game, the man should say "The two don't seem to like each other." which gives you a 19.8% chance. Just be patient. I know how difficult it could be.