You can't catch it in Emerald, sorry. You have to trade one from Pokemon Leafgreen.
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Misdreavus is in the Forest Area. Misdreavus does not just appear there, however. You have to place certain items to attract Misdreavus.
misdreavus you can get this from Pokemon leafgreen. Or shuppet/banette can learn it and even duskull/dusclops. gastly and all evolves can to
Misdreavus doesn't evolve
Misdreavus does NOT evolve by leveling up. If you want your Misdreavus to evolve you must expose it to a Dusk Stone and it becomes into a Mismagius.
You cannot evolve Misdreavus in Crystal.