It boosts attack and lowers special defense.Good,but see this: http://www.serebii.net/potw-dp/130.shtml
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Gyarados should learn Bite once Magikarp evolves at lv 20. Gyarados will then learn Dragon Rage at 25, Leer at 32, Hydro Pump at 41, and Hyper Beam at 52. Gyarados will also learn moves if you teach it TMs and HMs.
No.Magikarp cannot learn any TM moves if it evolves into gyarados then gyarados can learn TM moves and HM moves too. I Hope i helped you!
Gyarados is a dragon type of Pokémon that evolves from Magikarp. It can learn various moves such as dragon dance.
If you don't want it to learn any hm moves, then let it learn thrash, ice fang, bite, and use a TM a let it learn flamethrower.
Gyarados could win with earthquake but Omanyte could also win with rock slide.. hmm that's hard but in a long run id go with Gyarados because he learns more moves and alot stronger than omanyte