Mega Gyarados counters

#0130

water darkMega Legendary

Lobby CP

74,538

22,500

Timer

5:00

Attack

242

Defense

206

Difficulty

3.02

Pokebattler scale

Beating Mega Gyarados should take 3 trainers with level 40 counters. Caught CP 1,855-1,937 (you catch Gyarados).

Weak tofighting1.6xbug1.6xgrass1.6xelectric1.6xfairy1.6x

Who to bring

IncludeMega Legendary Shadow

Improve your raidweather · friendship · Mega in the lobby · Party Power · Adventure EffectsShow ▾

Weather

★ boosts a type this boss is weak to

No boost Sunny or clear ★Rainy ★Partly cloudy Cloudy ★Windy Snow Fog

Friendship

every trainer in the lobby who is your friend

None Good friend (+3%)Great friend (+5%)Ultra friend (+7%)Best friend (+10%)

Mega in the lobby

a Mega boosts every trainer's attacks: 1.3x of its own type, 1.1x of others

Try a Fighting Mega — most top counters attack with Fighting

Party Power

Party Play: the charged move after a full meter does 2x

Off 2 trainers 3 trainers 4 trainers

Adventure Effects

only these three change a raid

Behemoth Blade (+10% attack)Behemoth Bash (+10% defense)Dynamic Punch+ (+15% attack vs Mega)

Of the game's eleven Adventure Effects only Behemoth Blade (Crowned Sword Zacian), Behemoth Bash (Crowned Shield Zamazenta) and Dynamic Punch+ (Mega Mewtwo X) change a raid; Roar of Time, Spacial Rend, Freeze Shock, Ice Burn, Sunsteel Strike, Moongeist Beam, Future Sight+ and Dynamax Cannon act outside raids. Dynamic Punch+ also breaks two Super Mega shields at once; that part is not simulated. Sources: the full list, Behemoth Blade / Bash, Dynamic Punch+.

Best counters

Mega, Legendary, Shadow · level 40

The best Mega Gyarados counters are Mega Mewtwo X, Keldeo, Shadow Raikou, Kartana, Shadow Conkeldurr & Shadow Blaziken.

Suggested party of sixat most one Mega

M. Mewtwo X
Keldeo
S. Raikou
Kartana
S. Conkeldurr
S. Blaziken

11 more Megas ranked inside the top six — a party can hold only one Mega, so the best one stays and the next non-Mega takes the slot.

Ranked by Estimator (trainers needed); small print: time to winOrder byEstimatorOverall %

1Mega Mewtwo XMegaLegendarypartyCounter / Dynamic Punch+2.4411:21
2Mega LucarioMegaForce Palm / Aura Sphere2.8513:16
3KeldeoLegendarypartyLow Kick / Secret Sword3.1314:34
4Mega FalinksMegaCounter / Brick Break+3.2214:58
5Mega Raichu XMegaThunder Shock / Volt Tackle+3.2214:58
6Mega SceptileMegaFury Cutter / Frenzy Plant3.2615:10
7Mega ChesnaughtMegaVine Whip / Seed Bomb+3.2815:14
8Mega GalladeMegaLow Kick / Sacred Sword3.2815:14
9Mega Mewtwo YMegaLegendaryCounter / Thunderbolt3.3715:39
10Mega Raichu YMegaThunder Shock / Zap Cannon+3.3815:42
13Shadow RaikouShadowLegendarypartyThunder Shock / Aura Sphere3.6717:03
15KartanaLegendarypartyFury Cutter / Sacred Sword3.7017:13
16Shadow ConkeldurrShadowpartyForce Palm / Dynamic Punch3.7117:15
17Shadow BlazikenShadowpartyCounter / Aura Sphere3.8217:45

More orders under All settings (Sort by). The top 15 in detail.

Build and order a party of six →Plan your raid lobby →

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The Pokebox saved in this browser · each at its own level, IVs and moves.

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Raid tier — Legendary Mega Raid

Super Mega Legendary Super Mega Primal Mega Legendary Mega Elite Shadow Tier 5 Tier 5 Shadow Tier 3 Tier 3 Shadow Tier 1 Tier 1 Tier 4 Tier 2

Related countersGyarados

Raid alerts…

Top 15 Mega Gyarados counters in detail

Click a row for damage per move, breakpoints and the energy cycle. Click a column to sort. All 30 ranked attackers, with every column, are under All settings.

Trainers3small group

#	Attacker	Moveset
1	Mega Mewtwo Xpsychicfightingjoint top pick	fightingCounterfightingDynamic Punch+	6,112	11:21	2.44	6.0	44.7%
2	Mega Lucariofightingsteel	fightingForce PalmfightingAura Sphere	3,826	13:16	2.85	6.0	38.2%
3	Keldeowaterfighting	fightingLow KickfightingSecret Sword	3,698	14:34	3.13	6.0	34.8%
4	Mega Falinksfighting	fightingCounterfightingBrick Break+	3,670	14:58	3.22	6.0	33.9%
5	Mega Raichu Xelectric	electricThunder ShockelectricVolt Tackle+	3,510	14:58	3.22	6.0	33.9%
6	Mega Sceptilegrassdragon	bugFury CuttergrassFrenzy Plant	4,056	15:10	3.26	6.0	33.4%
7	Mega Chesnaughtgrassfighting	grassVine WhipgrassSeed Bomb+	4,093	15:14	3.28	5.8	33.3%
8	Mega Galladepsychicfighting	fightingLow KickfightingSacred Sword	4,521	15:14	3.28	6.0	33.3%
9	Mega Mewtwo Ypsychic	fightingCounterelectricThunderbolt	6,428	15:39	3.37	6.0	32.4%
10	Mega Raichu Yelectric	electricThunder ShockelectricZap Cannon+	3,780	15:42	3.38	6.0	32.3%
11	Mega Blazikenfirefighting	fightingCounterfightingAura Sphere	4,161	15:49	3.40	6.0	32.1%
12	Mega Heracrossbugfighting	bugFury CutterbugMegahorn	4,814	16:38	3.58	6.0	30.5%
13	Shadow Raikouelectric	electricThunder ShockfightingAura Sphere	3,452	17:03	3.67	6.0	29.7%
14	Mega Beedrillbugpoison	bugBug BitebugFell Stinger+	3,383	17:06	3.68	6.0	29.7%
15	Kartanagrasssteel	bugFury CutterfightingSacred Sword	3,677	17:13	3.70	6.0	29.5%

Ordered by Estimator alone, fewest trainers needed first. . The place badge names each row's Overall place on hover.

Times are one trainer with six copies of that attacker, level 40 at 15/15/15, no weather, no friendship, no dodging, Shadow / Mega / Legendary attackers hidden — the same defaults pokebattler.com's own counter pages open with. Open the full counter tool to change any of them. "Details" opens the per-move damage, breakpoints and energy cycle against Mega Gyarados.

Estimator is how many trainers of this strength the fight needs. Power is the share of Mega Gyarados's HP that six of that attacker remove inside one raid timer, so over 100% means they finish it with time to spare. Faints is how many of the six go down inside that timer.

Hardest movesets to raid against

The same boss is a different fight depending on what it knows. Each row re-simulates the top 6 counters above against one specific moveset; the list is ordered hardest first, and clicking a row filters the whole page to that moveset — the ranking, the estimator and the share link all follow.

Boss moveset	Win % (3)	Overall	Power	Time to win	Faints	Estimator
Random (any moveset)showing	35%	36%	32.0%	15:50	6.0	3.41
Dragon Breath / Hydro Pump	33%	27%	28.8%	17:37	6.0	3.79
Bite / Hydro Pump	33%	27%	28.9%	17:32	6.0	3.77
Waterfall / Hydro Pump	33%	27%	29.7%	17:03	6.0	3.67
Dragon Breath / Outrage	29%	35%	32.3%	15:41	6.0	3.38
Waterfall / Outrage	33%	34%	32.3%	15:41	6.0	3.37
Bite / Outrage	32%	35%	32.5%	15:37	6.0	3.36
Waterfall / Crunch	35%	41%	32.9%	15:24	6.0	3.31
Dragon Breath / Crunch	39%	44%	33.1%	15:19	6.0	3.29
Bite / Crunch	35%	45%	33.2%	15:17	6.0	3.29
Waterfall / Twister	33%	50%	33.6%	15:05	6.0	3.25
Dragon Breath / Twister	39%	55%	33.8%	14:60	6.0	3.23
Bite / Twister	35%	54%	33.9%	14:59	6.0	3.22

Measured over the top 6 attackers on the list above rather than by re-ranking the whole roster once per moveset — the ordering is what the table is for, and a full re-rank per moveset would cost ten times the page's whole simulation budget. Win % is the share of runs 3 trainers of those attackers finish inside the raid timer. Overall is Pokebattler's published blend on its own absolute scale (higher is easier), not a percentage of the best row the way the ranked table's Overall column is — which is why an easy boss reads well above 100% here.

Simulating each boss moveset…

Mega Gyarados weaknesses and resistances

Every one of the 18 attacking types against this boss's typing. GO multipliers: 1.6x super effective, 2.56x doubly, 0.625x resisted, 0.39x doubly resisted.

fighting1.6x bug1.6x grass1.6x electric1.6x fairy1.6x normal1x flying1x poison1x ground1x rock1x dragon1x ghost0.63x steel0.63x fire0.63x water0.63x ice0.63x dark0.63x psychic0.39x

Weak (5)
Neutral (6)
Resists (7)

It resists psychic0.39xghost0.625xsteel0.625xfire0.625xwater0.625xice0.625xdark0.625x— bringing one of those is throwing damage away.

What Mega Gyarados throws at you

Its standard movepool, with the damage window a dodge has to beat.

Fast moves

Move	Power	Energy	Duration	Hits at
waterWaterfallSTAB	13	+7	1.0s	0.75s
darkBiteSTAB	6	+4	0.5s	0.30s
dragonDragon Breath	6	+4	0.5s	0.30s

Charged moves

Move	Power	Energy	Duration	Hits at
waterHydro PumpSTAB	135	-100	3.5s	1.10s
dragonOutrage	110	-50	4.0s	2.60s
darkCrunchSTAB	65	-33	3.0s	1.10s
dragonTwister	50	-33	3.0s	1.15s

Catch CP

What the encounter after the fight can hand you.

IV spread	CP at L20	CP at L25 (weather boosted)
10/10/10floor	1,855	2,319
11/11/11	1,871	2,339
12/12/12	1,888	2,360
13/13/13	1,904	2,380
14/14/14	1,921	2,401
15/15/15hundo	1,937	2,422

Caught CP range 1,855 - 1,937, or 2,319 - 2,422 when the weather boosts it.

A raid encounter is level 20 (level 25 weather boosted) and cannot roll an IV below 10/10/10. Anything outside the first range is not this raid's reward.

When it is in raids

From the raid schedule, refreshed daily.

Mega Gyarados is not on the raid schedule right now. The simulation above is still exact for the tier chosen — any boss can be simulated, current or not.

All settings

Mega Legendary: 22,500 HP, 5:00 timer, boss Attack 242 / Defense 206 (15/15/15 at tier CPM 0.79).

Raid bossAttacker levelAttacker IVsWeatherFriendshipDodgingTrainers in the lobbyMega in the lobbyParty Play trainersBoss fast moveBoss charged moveSort by

Attackers allowed

ShadowMega and PrimalLegendary, Mythical, Ultra BeastLegacy and Elite TM moves

Share these exact settings

Every column, and pokebattler.com's own rank

On a phone the list shows estimator, time to win and faints. Overall, Power, win chance, CP, DPS and TDO appear on a wider screen.

#	Attacker	Moveset	Overall	Power	Est.Estimator	TimeTime to win	Faints	Win % (3)	CP	DPS	TDO
1	Mega Mewtwo X psychicfightingmega Counter / Dynamic Punch+	Counter / Dynamic Punch++26 more movesets	100%	44.7%	2.44	11:21	26.4	100%	6,112	34.7	955
2	Mega Lucario fightingsteelmega Force Palm / Aura Sphere	Force Palm / Aura Sphere+23 more movesets	83%	38.2%	2.85	13:16	34.9	100%	3,826	29.9	756
3	Keldeo waterfighting Low Kick / Secret Sword	Low Kick / Secret Sword+11 more movesets	76%	34.8%	3.13	14:34	31.6	98%	3,698	27.0	759
4	Mega Falinks fightingmega Counter / Brick Break+	Counter / Brick Break++7 more movesets	73%	33.9%	3.22	14:58	38.7	54%	3,670	26.5	662
5	Mega Raichu X electricmega Thunder Shock / Volt Tackle+	Thunder Shock / Volt Tackle++35 more movesets	71%	33.9%	3.22	14:58	45.8	54%	3,510	26.8	537
6	Mega Sceptile grassdragonmega Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	70%	33.4%	3.26	15:10	47.2	60%	4,056	26.4	526
7	Mega Chesnaught grassfightingmega Vine Whip / Seed Bomb+	Vine Whip / Seed Bomb++20 more movesets	75%	33.3%	3.28	15:14	25.3	30%	4,093	25.5	968
8	Mega Gallade psychicfightingmega Low Kick / Sacred Sword	Low Kick / Sacred Sword+19 more movesets	71%	33.3%	3.28	15:14	43.1	22%	4,521	26.1	572
9	Mega Mewtwo Y psychicmega Counter / Thunderbolt	Counter / Thunderbolt+26 more movesets	69%	32.4%	3.37	15:39	40.6	12%	6,428	25.3	642
10	Mega Raichu Y electricmega Thunder Shock / Zap Cannon+	Thunder Shock / Zap Cannon++35 more movesets	66%	32.3%	3.38	15:42	65.8	74%	3,780	27.3	436
11	Mega Blaziken firefightingmega Counter / Aura Sphere	Counter / Aura Sphere+20 more movesets	66%	32.1%	3.40	15:49	63.3	74%	4,161	26.8	544
12	Mega Heracross bugfightingmega Fury Cutter / Megahorn	Fury Cutter / Megahorn+17 more movesets	65%	30.5%	3.58	16:38	39.1	0%	4,814	23.7	653
13	Shadow Raikou electricshadow Thunder Shock / Aura Sphere	Thunder Shock / Aura Sphere+9 more movesets	62%	29.7%	3.67	17:03	52.3	0%	3,452	23.5	470
14	Mega Beedrill bugpoisonmega Bug Bite / Fell Stinger+	Bug Bite / Fell Stinger++23 more movesets	60%	29.7%	3.68	17:06	72.6	44%	3,383	25.1	400
15	Kartana grasssteel Fury Cutter / Sacred Sword	Fury Cutter / Sacred Sword+14 more movesets	61%	29.5%	3.70	17:13	53.0	0%	3,677	23.3	487
16	Shadow Conkeldurr fightingshadow Force Palm / Dynamic Punch	Force Palm / Dynamic Punch+11 more movesets	61%	29.4%	3.71	17:15	51.8	0%	3,337	23.2	494
17	Shadow Blaziken firefightingshadow Counter / Aura Sphere	Counter / Aura Sphere+20 more movesets	57%	28.6%	3.82	17:45	78.0	8%	2,848	24.0	390
18	Mega Gardevoir psychicfairymega Charm / Dazzling Gleam	Charm / Dazzling Gleam+19 more movesets	61%	28.5%	3.83	17:48	40.3	0%	4,512	22.1	764
19	Shadow Sceptile grassshadow Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	56%	27.6%	3.95	18:23	63.1	0%	2,757	22.0	378
20	Zeraora electric Volt Switch / Plasma Fists	Volt Switch / Plasma Fists+9 more movesets	57%	27.5%	3.96	18:25	53.3	0%	3,419	21.7	465
21	Mega Rayquaza dragonflyingmega Dragon Tail / Dragon Ascent	Dragon Tail / Dragon Ascent+11 more movesets	58%	27.4%	3.98	18:30	46.8	0%	5,713	21.4	518
22	Mega Latios dragonpsychicmega Dragon Breath / Aura Sphere	Dragon Breath / Aura Sphere+9 more movesets	57%	27.4%	3.99	18:32	53.5	0%	5,007	21.5	450
23	Shadow Mewtwo psychicshadow Counter / Thunderbolt	Counter / Thunderbolt+23 more movesets	55%	27.1%	4.03	18:43	66.0	0%	4,178	21.6	382
24	Shadow Thundurus (Therian) electricflyingshadow Volt Switch / Wildbolt Storm	Volt Switch / Wildbolt Storm+9 more movesets	54%	26.9%	4.06	18:53	80.1	8%	3,659	22.8	365
25	Mega Venusaur grasspoisonmega Vine Whip / Frenzy Plant	Vine Whip / Frenzy Plant+9 more movesets	57%	26.8%	4.08	18:57	40.2	0%	3,698	20.7	590
26	Terrakion rockfighting Double Kick / Sacred Sword	Double Kick / Sacred Sword+11 more movesets	53%	26.4%	4.13	19:12	72.3	0%	3,698	21.5	512
27	Shadow Chesnaught grassfightingshadow Vine Whip / Frenzy Plant	Vine Whip / Frenzy Plant+17 more movesets	55%	26.4%	4.14	19:13	51.8	0%	2,954	20.7	487
28	Shadow Galarian Zapdos fightingflyingshadow Counter / Close Combat	Counter / Close Combat+7 more movesets	54%	26.4%	4.14	19:15	57.7	0%	3,548	20.8	446
29	Shadow Latios dragonpsychicshadow Dragon Breath / Aura Sphere	Dragon Breath / Aura Sphere+9 more movesets	53%	26.2%	4.16	19:22	69.4	0%	3,812	20.9	344
30	Blaziken firefighting Counter / Aura Sphere	Counter / Aura Sphere+20 more movesets	48%	24.2%	4.51	20:58	87.1	0%	2,848	20.2	371

How accurate is this? Same top pick as pokebattler.com on 26 of 27 lists checked, 90% of its top tens shared; weakest on Mewtwo's default list (7 of 10).

Ranking. Our full ranking against the page pokebattler.com serves for the same boss and settings, on 27 boss and filter combinations read live (2026-10-04): 242 of 270 top-ten places shared, the same #1 on 26. On the six fixed reference bosses (read 2026-10-03): 85% top-ten overlap with its default filters, 83% with Shadow, Mega and Legendary on. A close top three is shown as a tie because the order inside it is below what we can measure.

Time to win. Graded with Pokebattler's own movesets against every boss moveset, average per boss: Tier 1 and 3 +0.1% to +1.2%; Tier 5 −2.9% to +1.3%; Mega −1.1% to +2.6%; Shadow Tier 5 −1.8% to +0.3%. One attacker can be off by more: median 1.6%, worst 15%, RMS per boss moveset 2.05%.

Known weak spots.

Mewtwo (Tier 5, default filters) shares 7 of Pokebattler's top 10: Absol, Incineroar and Salamence sit just outside ours, Polteageist, Cursola and Hisuian Typhlosion just inside.
Groudon (Tier 5, default filters) shares 7 of 10; its Grass and Water counters run 2-6% fast here.
Tier 5 times run about 2-3% fast for attackers that faint often, and 2-3% slow on Mega Charizard Y and Mega Beedrill, whose counters resist the boss.
Tier 1 lists are the least checked: Combee (Tier 1) shares only 3 of Pokebattler's top 10, with Gigalith first here where Pokebattler puts Rhyperior.

Boss-by-boss accuracy report.

Ranked 30 attackers in 1.5 s (50 Monte Carlo runs each, seed 1). The same ranking as JSON: /api/raids/rank.