Lvl. 20
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A Magikarp should evolve at about lvl 40 on Pokemon diamond
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.
Magikarp don,t evovle with a stone it evovle at lvl 31 i think i.