Misty's Gyarados (Japanese: カスミのギャラドス Kasumi's Gyarados) was Misty's tenth Pokémon; she adopted it in the Kanto region after she returned home in Cerulean Blues. Its voice actor in both Japanese and English is Unshō Ishizuka.
Taking over the Cerulean City Gym wasn't easy for Misty. Not only were there rumors of PIA inspectors arriving, an angry Gyarados was causing chaos. Misty tried many attempts to stop it but had to resort to locking it in a cage for a while. However, when the Invincible Pokémon Brothers got their Tentacruel to attack it with Poison Sting, Misty took the attack for Gyarados and earned its trust. Calmed, it finally allowed her to return it to its Poké Ball.
The capture of Gyarados is significant as Misty had been afraid of the species up until this point. This came from a traumatic event in her childhood when she had crawled into the mouth of a sleeping Gyarados. Getting it to earn her trust also led to her passing the inspection and truly earning Gym Leader status.
Gyarados is officially a Gym Pokémon. However, Misty used it when she visited Ash in Hoenn and in The Mastermind of Mirage Pokémon. It is possible that she could take it with her if she ever rejoins Ash on his journey.
Gyarados appeared before its capture as a Magikarp in The Misty Mermaid.
Misty also has a Gyarados in the manga counterpart to the anime, but, unlike in the anime, it was the first Pokémon she ever caught, and was nicknamed Gyara. She trained it carefully until it evolved.
