Hoothoot is normally unavailble in firered you will need to have emerald version trade you one or you can get one from colosseum.
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You can get it only by trading from a II. or IV. Generation game or from Emerald.
Yes, you can actually find Hoothoot in Pokemon Emerald. You must first beat the Elite four. As a bonus for beating it, the safari zone with have an extention. It's north of the entrance, just head up, and turn on the first right. Hoothoot are there, it just may take a while to find them.
You can find it in eterna forest (night only). I hope this helps.
In Pokemon Diamond, I would say it is easy to find a Noctowl or Hoothoot after it becomes dark.
You cant find it in Firered only leafgreen.