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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.
Route 47 is in the cave at Cianwood City
Hiker Parry is on route 47. send messages to Iainpg9 below
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).
Route 38 and 39 with a 5% chance to encounter and route 47 with a 20% chance to encounter.