You evolve it at level 20
Lv20
Gyarados does not evolve any further, it is the final evolution of Magikarp.
Magikarp evolves at level 20.
A Magikarp should evolve at about lvl 40 on Pokemon diamond
magikarp evolves at level 20 in all games
Magikarp can evolve into Gyarados, starting at level 20.
Magikarp evolve at level 20.
Get the Exp. Share and let your Magikarp hold it. When you battle, use a strong Pokemon and Magikarp will get some Exp. That's how I got my Magikarp to Evolve.
In Pokémon Ruby, Magikarp will evolve into Gyarados at Level 20.
20
No, Magikarp cannot evolve in the Daycare in Pokémon Ruby.
The weakest in the whole entire game is magikarp