Catch a hoothoot in route 29. (they're everywhere at night) or headbutt a tree in the Ilex Forest. If you do this in the day, it will be asleep. Easy catching!
Raise it to level 20 for a Noctowl. Once it evolves, it will learn Reflect(25), Take down(33), Confusion(41), and Dream eater(57).
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hoothoot evolves into noctowl at level 20
On route 29, just after the first town, New Bark Town. You can only catch Noctowl at night though, that might be why you're having trouble.
First you have to push down A, B at the same time while you stand in front of the building then a noctowl will fly you over.
noctowl
Evolve a hoohthoot in emerald and trade it.