Mega Gyrados (under normal battle conditions), is weak to fighting, bug, grass, electric, and fairy moves.
It is Immune to psychic moves, and resistant to ghost, steel, fire, water, ice, and dark moves.
Note carefully that these strengths and weakness are different from regular Gyarados, so make sure it is in its Mega Evolution before you count on this information.
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Gyarados's weakness is Thunder and Dragon.=] Try out Pokemon Platinum,Diamond,Pearl,and Crystal Version.It has Gyarados in it. -Aznlilife Actually, Gyarados's Weaknesses would be Rock and Lightning. Gyarados is a water\flying type, flying being weak to rock/electricity and water being weak to electricity. If you used an electric type attack on Gyarados, it would do x4 damage instead of x2. using a grass type move on Gyarados would only have a x1 damage ratio because, well you can figure that out. Gyarados is not weak to dragon because GyARADOS IS NOT DRAGON. only dragon is weak against dragon. -tuttle
Gyarados is a water type. Water type Pokemon are weak when battling a grass type Pokemon.
i know electric is super effective against gyarados and i think ice is to. glad to help 1ce again ;) Don't try grass types against gyarados he'll use ICE FANG!!!!!!
electric Pokemon
Lots of pokemon types can be weak against one but, obviously, the basics are,Grass is weak against fire, fire is weak against water, water is weak against grass, water is weak against electric, metal is weak against fire, normal is weak against dark, dark is weak against poison, flying is weak against electric, Sorry for boring you, ( I am under the age of 10) XP Thanks for your time :D