Gyarados uses the Intimidate Ability, which lowers the opponent's Attack stat by one stage upon entering the field. Its Hidden Ability is Moxie, which raises the Pokémon's Attack stat by one stage whenever it knocks out an opponent.
Magikarp gain the opportunity to evolve into Gyarados starting at Level 20.
Gyarados is a large, monstrous serpent-like Pokemon. Gyarados is completely blue at the top of its body with some patches that are light yellow along with its underbelly. It has a large mouth with four sharp teeth inside. Its lips are the same color as its underbelly and the patches that are along the side of its body. It has a dark blue crest which sits on its forehead. There are white fins that are at the back of the mouth. It has two whiskers, which are called barbels, hanging off its face, they are either blue or white depending on the gender of Gyarados. It has four spiky plates that go down its back, two not too far away from its head and the other two at the other end. It has small eyes that usually makes Gyarados look angry, its iris color is reddish. For its tail, it is basically a fin and is kind of similar to the fins on its head.
The male Gyarados has blue barbels and the female has white barbels. A Shiny male has red barbels.
Gyarados can be caught in Pokémon Gold, Silver and Crystal by either surfing or fishing with the Good Rod or Super Rod at the Lake of Rage, as well as fishing in Fuchsia City. A special shiny Gyarados, more commonly known as the Red Gyarados, can also be caught at the Lake of Rage.
In Pokémon Ruby, Sapphire and Emerald, Gyarados can be caught by fishing with the Super Rod in Sootopolis City. In Pokémon FireRed and LeafGreen, it can be fished up with the Super Rod in any body of water.
Using the Super Rod, Gyarados can be caught in any body of water in Pokémon Diamond, Pearl and Platinum, as well as the Good Rod in Diamond and Pearl. It can also be fished up using these Rods in Pokémon HeartGold and SoulSilver at the Lake of Rage, Fuchsia City, Seafoam Islands, Cerulean Cave and Mt. Silver. It can also be caught in the Marshland, Meadow and Wetland areas of the Safari Zone. In the Marshland area, it is standard catch when using the Super Rod, however by placing three water blocks in the area, it can be caught with the Good Rod. Placing seven water blocks or ten water blocks in the Meadow area will reel Gyarados with the Good Rod and Super Rod respectively, with those caught with the Super Rod being a higher level. Finally, placing down six water blocks in the Wetland area will yield Gyarados using the Super Rod. Mirroring the original games, a Red Gyarados can also be caught at the Lake of Rage.
In Pokémon X and Y, Gyarados can be fished up with the Super Rod at Route 3, Route 22 and Parfum Palace. It can be also be caught in the Friend Safari. In Pokémon Omega Ruby and Alpha Sapphire, it can be caught using the Super Rod in Sootopolis City.
Trading Card Game
Gyarados is seen in the anime a couple of times, mostly in an angry state. James of Team Rocket owned a Magikarp that evolved into Gyarados as he kicked it just before releasing it. Gyarados is also a Pokemon that Misty obtains. She finds it back at her gym, and befriends it by the end of the Pokemon Inspection Agencies tests. Gyarados also appeared in the First Movie. It had to fight one of Mewtwo's clones.
A red Gyarados appears in Talkin' 'Bout an Evolution and Rage Of Innocence. It was on a rampage until Lance captured it. Lance used this Gyarados in Gaining Groudon and The Scuffle of Legends to stop Groudon and Kyogre.
Gyarados is in the Underused (UU) tier of competitive battling. With a great typing that gives it resistances to Fire, Fighting, and an immunity to Ground, Gyarados can check many threats in the UU tier, such as Mamoswine and Infernape. With Dragon Dance at its disposal, Gyarados can become a fearsome set-up sweeper that can stand out as among the tier's biggest threats. STAB moves in Waterfall and Bounce coupled with coverage moves like Earthquake, Stone Edge, and Double-Edge allow for it to become a difficult Pokémon to wall. Thanks to Intimidate, Gyarados has plenty of set up opportunities to set up and terrorize at opposing teams. Its best set is a Substitute + Dragon Dance set that takes advantage of the switches it can force with Intimidate as well as protect it from status, such as Scald burns in particular or paralysis. Other sets include a Dragon Dance set with three attacks to give Gyarados more flexibility in terms of picking and choosing which Pokémon it can take care of and a defensive set uses Intimidate to become an effective physical wall against Pokémon like Mamoswine while providing utility in Roar or Toxic. However, Gyarados is not flawless, as it suffers from being weak to Stealth Rock and having a x4 weakness to Electric-type attacks, which can hinder its offensive and defensive capabilities quite a bit. Gyarados also has trouble with fitting in all the coverage it needs to sweep teams with consistency. For the defensive set in particular, Gyarados suffers from a lack of reliable recovery, having to rely on the RestTalk combination, which can be unreliable at times.
Gyarados is also viable in the Overused (OU) tier of competitive battling. With a great set of resistances and a crucial Ground immunity, Gyarados has the bulk to take advantage of that thanks to Intimidate and can find numerous set-up opportunities. Gyarados is capable of being a great offensive sweeper with a bulky Dragon Dance set with Substitute that takes advantage of its plethora of opportunities to wreak havoc on opposing teams. It can even run a defensive set that acts as a mixed wall against Pokémon such as Mega Charizard Y, Volcarona, Keldeo, and Mega Metagross while providing utility with moves like Thunder Wave, Roar, or Dragon Tail. However, Gyarados suffers from having a weakness to Stealth Rock, and with a lack of reliable recovery, it can be worn down and pressured quite a bit. Gyarados's Speed stat is mediocre by OU standards, and even after a Dragon Dance boost, it can be outsped by a number of threats in the tier.
Gyarados does not learn any Egg Moves.
Magikarp Exclusive Moves
Transfer Only Z-Moves
Related Threadsman shouldn't gyarados be abe to learn fly by now? - last post @ Dec 14, 2013
Mega Gyarados and Mega Gardevoir (spoilers) - last post @ Nov 8, 2013
i killed a gyarados that gave me a 16 speed boost - last post by @ Sep 9, 2009
Can you get S.Gyarados? - last post by @ Apr 24, 2007
How to level up Gyarados/Blastoise quickly - last post by @ Jan 2, 2018