Magikarp evolves into Gyarados at level 20 in Pokémon FireRed.

Quick Scoop

  • In FireRed, once your Magikarp reaches level 20, it will try to evolve at the end of that level-up battle.
  • You do not need any stone or special item; it evolves purely by leveling.
  • Many players recommend switch-training or using daycare/EXP share–style methods in newer games to speed this up, but in FireRed it’s mainly about classic grinding and daycare steps.

Think of Magikarp as a weak investment that suddenly turns into a powerhouse stock the moment it hits level 20 and becomes Gyarados.

TL;DR: For “what level does Magikarp evolve Fire Red” – train Magikarp to level 20, finish one battle to trigger the evolution, and enjoy your new Gyarados.

Information gathered from public forums or data available on the internet and portrayed here.