No because it's not a flying type.
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catch a Pokemon that can learn fly, put it in your party, and WALA! you can teach it fly!
fly is an hm. no Pokemon learns it by lvling up. except rayquaza
Teach it to a Pokemon, enter the Pokemon screen, chose the Pokemon that knows fly and select where you want to fly to.
No, if you try to fly to the place where cressilea is it will move you have to walk there or keep changing routes until cressilea is in yours
No, Gastly cannot learn to fly.