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A Water/Flying type Pokemon and the evolved form of Magikarp.
Overview Gyarados is one of the most powerful common Water type Pokemon in the series. It has very powerful attacks that make it stand out from standard Water type Pokemon levels, such as Hyper Beam and Dragon Breath. Gyarados has quite a temper, so its good to meet it as a Magikarp. Most people don't though, do to Magikarp's weakness. Even though it is true, the stonger of a relationship you have with a Magikarp, the more that will grow when it evolves as a Gyarados and the more protection you'll have.
Gyarados has very powerful Water based attacks but the more poweful ones aren't Water type at all. Such as Hyper Beam and in special cases, Dragon Breath.