The standard Gyarados set is the Bulky Dragon Dance set:Can anyone tell me gyarados' weakness and some good partners for it?the analysis is confusing.
Also what's the standard set for it?The same with pre aegi ban?

Gyarados @ Leftovers
Ability: Intimidate
EVs: 88 HP / 192 Atk / 4 Def / 224 Spe
Adamant Nature
- Substitute / Taunt
- Dragon Dance
- Waterfall
- Bounce
This Gyarados is supposed to be able to set up Dragon Dances while it is tanking attacks with its bulk and Intidmidate. Waterfall and Bounce is STAB attacks, but you could use Earthquake insted of Bounce. If yo do you will be counterd by bulky grass types, but with Bounce Electric types will counter you. Substitute is usally a better option, but you can use Taunt agianst walls that is trying to force you out whit Roar, or Whirlwind such as Skarmory. The EVs is used to:
- Outspeed Noivern when you have +1 speed
- Be able to take a burned Ferrothorns Power Whip without breaking the Sub
- Stop many water types from breakning your Sub, like Slowbro without psychic coverage
The standard Mega-Gyarados set is the Dragon Dance set:

Gyarados-Mega @ Gyaradosite
Ability: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Waterfall
- Earthquake
- Ice Fang / Substitute / Taunt
With this set you are aiming to sweep the opposing team with raw power. You ser up Dragon Dances on resisted/ weak attacks, or you can play mindgames and don't mega evolve directly, then you can set up on fighting types such as Conkeldurr.
Ice Fang is for Grass types, or you can use Substitute / Taunt to prevent status.
Gyarados is weak to Electric, and Rock types and Mega Gyarados is weak to Fighting, Bug, Grass, Electric, and Fairy types.
But if you ment what Pokemons Gyarados is weak to so here is some examples:
Ferrothorn is probably the best counter to both mega and non-mega Gyarados, its high physical defence and good typing stops Gyarados
Rotom-W can counter all Gyaradoses but loses to Mold Breaker Earthquake and boosts.
Slowbro is bulky enough to handle all of Gyarados sets.
Other physical walls such as Skarmory and Mandibuzz, but Gyarados can beta alot of them with Taunt
Thats it, it got a little long, but I wanted to give you as much information as possible. I hope I answered your questions [: