A Magikarp should evolve at about lvl 40 on Pokemon diamond
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The weakest Pokemon in diamond is a magikarp. It is also the weakest of all the Pokemon existed. Magikarp is weak but it will evolve to a mighty gyarados.
Magikarp evolve at level 20.
Magikarp evolve at level 20.
20
I know that in Pokemon diamond and pearl (its the same in the first handbook) magikarp evolves into gyrados when its lvl 20. u should level it up by giving it exp. share