Lol. Soon we're going to have Scarfmegamixhydropumpmence.
Name: ChainGyara (yeah right)
Gyarados@Life Orb
Lonely (Intimidate)
60 Atk, 252 SpAtk, 198 Spd
-Dragon Dance
-Stone Edge
-Hydro Pump
-HP Bug / Ice Beam
Lol. Stone Edge 1HKOs other BulkyMence after 1 Dragon Dance. Hydro Pump 1HKOs Gliscor, Hippowdon, Donphan etc. HP Bug 2HKOs Celebi and Tangrowth, while Ice Beam one hits the dragons. This set is in the lul.
A mixed Gyarados set is indeed viable, although not with the above mentioned moveset or evs, Hippowdon, Donphan and Gliscor already fear coming into Gyarados as they are all beaten by STAB super effective Waterfall, Celebi and Tangrowth are counters and although Hp Bug 2hkos, Fire Blast would be way more effective against these pokes. Below is a mixed Gyarados set i've tried for a while with mixed results.
Gyarados (M) @ Life Orb
Trait: Intimidate
EVs: 4 HP / 154 Atk / 176 Spd / 176 SAtk
Naughty Nature (+Atk, -SDef)
- Waterfall
- Dragon Dance
- Thunder / Fire Blast
- Ice Fang / Earthquake / Fire Blast
Enough evs in speed to outspeed Max speed Timid Magnezone, as well as Adamant Breloom and Metagross, with one Dragon Dance it will hit 363 speed, surpassing the base 115s like Starmie and Raikou. Waterfall and Dragon Dance are fairly standard but with the rest of the movepool is where it gets interesting.
Thunder is a great move against most of Gyarados' counters who are primarly its fellow water types
OHKO on any Gyarados
252 Hp / 0 Sdef Slowbro 58-70%
252 Hp / 0 Sdef Vaporeon 43-52%
Other notable calcs:
252 Hp / 0 Sdef Forretress 42-49%
252 Hp / 0 Sdef Skarmory 77-90%
So as you can see Thunder is indeed a fairly decent move on Gyarados.
Fire Blast is listed as it helps you more with the Grass types that may hinder Gyarados as well as scoring the same damage on Skarmory as Thunder as well as OHKOing Forretess.
Calcs for Gyarados' main grass type counters are listed below:
252 Hp / 0 Sdef Celebi 49-59%
252 Hp / 0 Sdef Tangrowth 82-96%
Other notable Calcs:
252 Hp / 0 Sdef Breloom 90-100%
252 Hp / 0 Sdef Magnezone 61 - 72%
(Neutral Natured) 252 Hp / 128 Sdef Bronzong 45-53%
so Fire Blast does have its merits over Thunder, and it is possible to use both on one set although unadvisable as it would probaly be best to have another move running off of the boosts from Gyarados' Dragon Dance, which move you use is entirely up to you, you should already know the benefits of one over the other.