what level does magikarp evolve

Magikarp evolves into Gyarados starting at level 20. Once Magikarp reaches level 20, it will evolve upon gaining another level or when the evolution is manually triggered in some games. If Magikarp is already above level 20, it will evolve the next time it levels up. This evolution mechanic is consistent across multiple Pokémon games, including Pokémon Scarlet and Violet, Pokémon Brilliant Diamond and Shining Pearl, and earlier generations