The only way to obtain a Kabuto in Pokemon Crystal is to trade one over from Red, Yellow, or Blue.
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Kabuto evolves at level 40. To get Kabuto you extract it from a fossil.
Evolve Kabuto. Kabuto evolves at level 40.
It entirely depends on how you train your pokemon. Kabuto can evolve into Kabutops though, but Aerodactyl can't evolve.
Kabuto