I think level 100 but why don't you just go catch a gyradoas?
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Magikarp evolve at level 20.
Magikarp evolves to Gyarados at level 20 in every game. It learns Bite right away.The annoying Magikarp evolves into the awesome Gyrados at lvl 30
Magikarp evolve at level 20.
Magikarp evolves into Gyarados at level 20.
Magikarp evolves into Gyarados at level 20