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.
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hoothoot evolves into noctowl at level 20
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).
You can only catch Zapdos in Crystal by cheating. otherwise it is not in the game
you don't catch articuno in crystal but you can get one from red, blue or yellow.
catch it in the wild