Galarian Yamask counters

#0562

ground ghostTier 1

Lobby CP

3,365

600

Timer

3:00

Attack

Defense

Difficulty

0.05

Pokebattler scale

Beating Galarian Yamask should take 1 trainer with level 40 counters. Caught CP 516-561.

Weak toghost1.6xwater1.6xgrass1.6xice1.6xdark1.6x

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 Water Mega — most top counters attack with Water

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+ only counts against a Mega boss, so it changes nothing here. Sources: the full list, Behemoth Blade / Bash, Dynamic Punch+.

Best counters

Mega, Legendary, Shadow · level 40

The best Galarian Yamask counters are Mega Greninja, Necrozma (Dawn Wings), Kyurem (White), Shadow Darkrai, Shadow Hydreigon & Shadow Kingler.

Suggested party of sixat most one Mega

M. Greninja
Necrozma (Dawn Wings)
Kyurem (White)
S. Darkrai
S. Hydreigon
S. Kingler

6 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 GreninjaMegapartyWater Shuriken / Surf+0.050:08
2Mega StarmieMegaPsywave / Liquidation+0.050:09
3Mega HoundoomMegaSnarl / Dark Pulse+0.050:09
4Necrozma (Dawn Wings)LegendarypartyPsycho Cut / Moongeist Beam0.060:10
5Mega ChesnaughtMegaVine Whip / Seed Bomb+0.060:11
6Mega GengarMegaShadow Claw / Shadow Ball0.060:11
7Kyurem (White)LegendarypartyIce Fang / Ice Burn0.060:11
8Mega Mewtwo YMegaLegendaryConfusion / Future Sight+0.070:12
9Shadow DarkraiShadowLegendarypartySnarl / Foul Play0.070:12
10Shadow HydreigonShadowpartyBite / Brutal Swing0.070:12
12Shadow KinglerShadowpartyBubble / Crabhammer0.070:12

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

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

Best from your Pokebox

Pokebox

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

Search bosses

Type a name, then Enter or click a result

Raid tier — Solo 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 countersShadow Galarian Yamask Yamask

Raid alerts…

Top 15 Galarian Yamask 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.

Trainers1soloable

#	Attacker	Moveset
1	Mega Greninjawaterdarkjoint top pick	waterWater ShurikenwaterSurf+	3,784	0:08	0.05	5315.9%
2	Mega Starmiewaterpsychic	psychicPsywavewaterLiquidation+	3,701	0:09	0.05	4843.3%
3	Mega Houndoomdarkfire	darkSnarldarkDark Pulse+	3,842	0:09	0.05	4657.1%
4	Necrozma (Dawn Wings)psychicghost	psychicPsycho CutghostMoongeist Beam	4,099	0:10	0.06	4359.9%
5	Mega Chesnaughtgrassfighting	grassVine WhipgrassSeed Bomb+	4,093	0:11	0.06	4021.2%
6	Mega Gengarghostpoison	ghostShadow ClawghostShadow Ball	4,336	0:11	0.06	3791.1%
7	Kyurem (White)dragonice	iceIce FangiceIce Burn	4,605	0:11	0.06	3791.1%
8	Mega Mewtwo Ypsychic	psychicConfusionpsychicFuture Sight+	6,428	0:12	0.07	3725.6%
9	Shadow Darkraidark	darkSnarldarkFoul Play	3,739	0:12	0.07	3707.3%
10	Shadow Hydreigondarkdragon	darkBitedarkBrutal Swing	3,625	0:12	0.07	3633.1%
11	Mega Sceptilegrassdragon	bugFury CuttergrassFrenzy Plant	4,056	0:12	0.07	3633.1%
12	Shadow Kinglerwater	waterBubblewaterCrabhammer	2,829	0:12	0.07	3633.1%
13	Shadow Crawdauntwaterdark	darkSnarlwaterCrabhammer	2,474	0:12	0.07	3633.1%
14	Mega Tyranitarrockdark	darkBitedarkBrutal Swing	5,347	0:12	0.07	3600.1%
15	Shadow Greninjawaterdark	waterBubblewaterHydro Cannon	2,654	0:12	0.07	3538.7%

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 Galarian Yamask.

Estimator is how many trainers of this strength the fight needs. Power is the share of Galarian Yamask'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 % (1)	Overall	Power	Time to win	Estimator
Random (any moveset)showing	100%	1172%	4001.7%	0:11	0.06
Astonish / Night Shade	100%	1153%	3981.4%	0:11	0.06
Astonish / Rock Tomb	100%	1180%	4001.7%	0:11	0.06

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 1 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…

Galarian Yamask 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.

ghost1.6x water1.6x grass1.6x ice1.6x dark1.6x flying1x ground1x steel1x fire1x psychic1x dragon1x fairy1x rock0.63x bug0.63x normal0.39x fighting0.39x poison0.39x electric0.39x

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

It resists normal0.39xfighting0.39xpoison0.39xelectric0.39xrock0.625xbug0.625x— bringing one of those is throwing damage away.

What Galarian Yamask throws at you

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

Fast moves

Move	Power	Energy	Duration	Hits at
ghostAstonishSTAB	7	+13	1.0s	0.60s

Charged moves

Move	Power	Energy	Duration	Hits at
ghostNight ShadeSTAB	60	-50	2.5s	2.00s
rockRock Tomb	65	-50	3.0s	2.05s

Catch CP

What the encounter after the fight can hand you.

IV spread	CP at L20	CP at L25 (weather boosted)
10/10/10floor	516	646
11/11/11	525	657
12/12/12	534	668
13/13/13	543	679
14/14/14	552	690
15/15/15hundo	561	701

Caught CP range 516 - 561, or 646 - 701 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.

Galarian Yamask 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

Tier 1: 600 HP, 3:00 timer, boss Attack 65 / Defense 93 (15/15/15 at tier CPM 0.5974).

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	Win % (1)	CP	DPS	TDO
1	Mega Greninja waterdarkmega Water Shuriken / Surf+	Water Shuriken / Surf++17 more movesets	100%	5315.9%	0.05	0:08	100%	3,784	73.9	606
2	Mega Starmie waterpsychicmega Psywave / Liquidation+	Psywave / Liquidation++44 more movesets	76%	4843.3%	0.05	0:09	100%	3,701	71.8	646
3	Mega Houndoom darkfiremega Snarl / Dark Pulse+	Snarl / Dark Pulse++17 more movesets	77%	4657.1%	0.05	0:09	100%	3,842	76.1	712
4	Necrozma (Dawn Wings) psychicghost Psycho Cut / Moongeist Beam	Psycho Cut / Moongeist Beam+14 more movesets	66%	4359.9%	0.06	0:10	100%	4,099	63.1	631
5	Mega Chesnaught grassfightingmega Vine Whip / Seed Bomb+	Vine Whip / Seed Bomb++20 more movesets	69%	4021.2%	0.06	0:11	100%	4,093	61.6	667
6	Mega Gengar ghostpoisonmega Shadow Claw / Shadow Ball	Shadow Claw / Shadow Ball+31 more movesets	53%	3791.1%	0.06	0:11	100%	4,336	52.4	603
7	Kyurem (White) dragonice Ice Fang / Ice Burn	Ice Fang / Ice Burn+17 more movesets	62%	3791.1%	0.06	0:11	100%	4,605	55.5	638
8	Mega Mewtwo Y psychicmega Confusion / Future Sight+	Confusion / Future Sight++26 more movesets	59%	3725.6%	0.07	0:12	100%	6,428	59.5	696
9	Shadow Darkrai darkshadow Snarl / Foul Play	Snarl / Foul Play+14 more movesets	58%	3707.3%	0.07	0:12	100%	3,739	56.9	668
10	Shadow Hydreigon darkdragonshadow Bite / Brutal Swing	Bite / Brutal Swing+9 more movesets	56%	3633.1%	0.07	0:12	100%	3,625	50.2	602
11	Mega Sceptile grassdragonmega Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	57%	3633.1%	0.07	0:12	100%	4,056	50.2	602
12	Shadow Kingler watershadow Bubble / Crabhammer	Bubble / Crabhammer+14 more movesets	51%	3633.1%	0.07	0:12	100%	2,829	52.0	624
13	Shadow Crawdaunt waterdarkshadow Snarl / Crabhammer	Snarl / Crabhammer+11 more movesets	53%	3633.1%	0.07	0:12	100%	2,474	50.5	606
14	Mega Tyranitar rockdarkmega Bite / Brutal Swing	Bite / Brutal Swing+15 more movesets	61%	3600.1%	0.07	0:12	100%	5,347	49.8	604
15	Shadow Greninja waterdarkshadow Bubble / Hydro Cannon	Bubble / Hydro Cannon+14 more movesets	53%	3538.7%	0.07	0:12	100%	2,654	50.3	620
16	Primal Kyogre watermega Waterfall / Surf	Waterfall / Surf+5 more movesets	56%	3487.8%	0.07	0:12	100%	5,902	48.7	609
17	Shadow Tyranitar rockdarkshadow Bite / Brutal Swing	Bite / Brutal Swing+15 more movesets	54%	3487.8%	0.07	0:12	100%	3,834	48.8	610
18	Shadow Galarian Darmanitan (Standard) iceshadow Ice Fang / Avalanche	Ice Fang / Avalanche+7 more movesets	49%	3487.8%	0.07	0:12	100%	3,105	50.2	627
19	Shadow Mewtwo psychicshadow Psycho Cut / Shadow Ball	Psycho Cut / Shadow Ball+23 more movesets	50%	3446.4%	0.07	0:13	100%	4,178	49.1	620
20	Shadow Weavile darkiceshadow Snarl / Avalanche	Snarl / Avalanche+11 more movesets	50%	3432.8%	0.07	0:13	100%	3,005	50.9	646
21	Mega Absol darkmega Psycho Cut / Brutal Swing	Psycho Cut / Brutal Swing+9 more movesets	51%	3422.0%	0.07	0:13	100%	3,301	47.6	606
22	Mega Alakazam psychicmega Psycho Cut / Shadow Ball	Psycho Cut / Shadow Ball+17 more movesets	49%	3419.4%	0.07	0:13	100%	4,510	49.3	628
23	Mega Mewtwo X psychicfightingmega Psycho Cut / Shadow Ball	Psycho Cut / Shadow Ball+26 more movesets	54%	3379.6%	0.07	0:13	100%	6,112	53.8	694
24	Shadow Sceptile grassshadow Bullet Seed / Frenzy Plant	Bullet Seed / Frenzy Plant+11 more movesets	48%	3353.6%	0.07	0:13	100%	2,757	46.3	602
25	Shadow Cacturne grassdarkshadow Sucker Punch / Grass Knot	Sucker Punch / Grass Knot+14 more movesets	48%	3353.6%	0.07	0:13	100%	2,298	46.8	608
26	Shadow Giratina (Origin) ghostdragonshadow Shadow Claw / Shadow Force	Shadow Claw / Shadow Force+7 more movesets	49%	3348.4%	0.07	0:13	100%	3,683	50.7	660
27	Shadow Gengar ghostpoisonshadow Hex / Shadow Ball	Hex / Shadow Ball+31 more movesets	45%	3322.9%	0.07	0:13	100%	2,878	53.2	697
28	Shadow Haunter ghostpoisonshadow Lick / Shadow Ball	Lick / Shadow Ball+14 more movesets	41%	3307.8%	0.07	0:13	100%	1,963	48.5	638
29	Kyurem (Black) dragonice Dragon Tail / Freeze Shock	Dragon Tail / Freeze Shock+11 more movesets	52%	3277.9%	0.07	0:13	100%	4,605	53.2	707
30	Kartana grasssteel Fury Cutter / Leaf Blade	Fury Cutter / Leaf Blade+14 more movesets	48%	3229.4%	0.08	0:13	100%	3,677	46.5	627

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.

This boss on pokebattler.com. Boss-by-boss accuracy report.

Ranked 30 attackers in 0.1 s (50 Monte Carlo runs each, seed 1). Same boss on pokebattler.com. The same ranking as JSON: /api/raids/rank.