You can't catch Kabuto in Ruby, Sapphire, or Emerald. you have to trade from Leaf Green or Fire Red.
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You can't catch kabuto in emerald, but you can trade him over from leaf green or fire red
You must trade a kabuto from firered or leafgreen.
Kabuto evolves at level 40. To get Kabuto you extract it from a fossil.
Evolve Kabuto. Kabuto evolves at level 40.
The only way to obtain a Kabuto in Pokemon Crystal is to trade one over from Red, Yellow, or Blue.