If you pressed the B button during evolution, it will cancel the evolution and will evolve again after your Pokemon levels up again, it evolves AT level 20. It evolves into Gyarados.
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Lvl. 20
magikarp will evolve at lvl 20 to a gyarados
like every game it levels at lvl 20
At Lvl 22 I think.EditActually, it's level 20.
you can find them in many places but it is alot easier to get a magikarp and evolve it at lvl 20