How To Evolve Magikarp: 11 Steps (with Pictures) - WikiHow

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1 Obtain and upgrade your Mega Ring if you’re playing X and Y. In order to evolve Gyarados into Mega Gyarados, you will first need to get your Key Stone, which is embedded in a Mega Ring. Defeat your rival and then earn the Rumble Badge at Shalour Gym to earn the Key Stone needed to mega evolve your Pokémon. Then, take the badge to the top of the Tower of Mastery to receive the Mega Ring.[12] X Research source
- After obtaining the Mega Ring, get it upgraded by defeating your rival again in Kiloude City. Professor Sycamore will upgrade your ring right after the battle.
2 Get the Mega Bracelet from Steven in Alpha Sapphire and Omega Ruby. Once you surf across the water to the east side of Route 118, Steven will approach you and take you to the Southern Island. Once you defeat an enemy there, he’ll give you the Mega Bracelet that you can use for Mega Evolutions later in the game.[13]
3 Get the Key Stone from Dexio in Pokémon Sun and Moon. Once you beat the Elite 4 and become the Champion, travel along the Ancient Poni Path to run into Dexio and challenge him to a battle. After you defeat him, he’ll give you the Key Stone item that allows Pokémon to mega evolve.[14]
4 Obtain the Gyaradosite in the game. This is the Mega Stone required to evolve Gyarados into its Mega form during a battle. The location of the Gyaradosite will depend on the version of the game you are playing. [15] X Research source
- X and Y: Look near the east side of Couriway Town near three waterfalls at night.
- Alpha Sapphire and Omega Ruby: Find Chomper the Poochyena on Route 123. Give Chomper a scratch to receive the Gyaradosite.
- Sun, Moon, Ultra Sun, and Ultra Moon: Buy Gyaradosite from the Battle Tree for 64 Battle Points (BP).
5 Give your Gyarados the Gyaradosite as a held item. Find the Gyaradosite in your bag and choose to give it to the Gyarados in your party. If your Gyarados is already holding onto an item, remove the old one first.[16]
6 Select "Mega Evolve" during battle to turn into Mega Gyarados. Whenever you use Gyarados in a battle, tap the Mega Evolution option on screen before you choose an attack. Once you mega-evolve Gyarados, it will keep its form until the battle is over or until it faints.[17] X Research source
- It’s okay to switch out your Mega Gyarados during battle. It will still be mega-evolved when you switch it back in.