Yes you can. You need a Golbat and level it up with friendship.
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Crobat does not evolve.
The Weakness Of Crobat's Are Rock, Psychic, Electric and Ice.
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Aerodactyl has higher attack then Crobat, while Cobat is superior in defense. Crobat also learns hypnosis, and is the fastest of any Pokemon to learn it. That being said, it depends on your team.
Golbat evolves into Crobat when leveled up with enough friendship.