Gyarados is the most common Pokémon used by Pokémon League Champions, being used by Blue, Lance, and Wallace (although Blue does not always have a Gyarados, depending on the player's starter Pokémon). However, Blue is the only one to use it in the Pokémon World Tournament.
Gyarados is also a popular Pokémon among Gym Leaders, being used by Misty, Blue, Clair, and Crasher Wake. However, Misty doesn't use Gyarados during the Gym battle.
Gyarados has also been used twice by two villainous team leaders. The first instance was Cyrus and the second instance was Lysandre.
How does He do it?