Cloyster counters

#0091

water iceTier 1

Lobby CP

8,105

600

Timer

3:00

Attack

120

Defense

161

Difficulty

0.09

Pokebattler scale

Beating Cloyster should take 1 trainer with level 40 counters. Caught CP 1,383-1,455.

Weak tofighting1.6xrock1.6xgrass1.6xelectric1.6x

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+ 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 Cloyster counters are Mega Mewtwo X, Keldeo, Lucario, Thundurus (Therian), Regieleki & Shadow Raikou.

Suggested party of sixat most one Mega

M. Mewtwo X
Keldeo
Lucario
Thundurus (Therian)
Regieleki
S. Raikou

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 Mewtwo XMegaLegendarypartyCounter / Dynamic Punch+0.070:13
2Mega LucarioMegaForce Palm / Aura Sphere0.080:15
3Mega Mewtwo YMegaLegendaryPsycho Cut / Future Sight+0.090:17
4Mega Raichu YMegaVolt Switch / Wild Charge0.100:18
5Mega BlazikenMegaCounter / Aura Sphere0.100:18
6Mega Raichu XMegaThunder Shock / Volt Tackle+0.100:19
7Mega GalladeMegaLow Kick / Sacred Sword0.110:19
8KeldeoLegendarypartyLow Kick / Secret Sword0.110:19
9LucariopartyForce Palm / Aura Sphere0.110:19
10Thundurus (Therian)LegendarypartyVolt Switch / Wildbolt Storm0.110:19
11RegielekiLegendarypartyThunder Shock / Thunder Cage0.110:19
12Shadow RaikouShadowLegendarypartyThunder Shock / Aura Sphere0.110:20

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

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

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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 Cloyster

Raid alerts…

Top 15 Cloyster 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 Mewtwo Xpsychicfightingjoint top pick	fightingCounterfightingDynamic Punch+	6,112	0:13	0.07	0.0	3379.4%
2	Mega Lucariofightingsteel	fightingForce PalmfightingAura Sphere	3,826	0:15	0.08	0.0	2906.4%
3	Mega Mewtwo Ypsychic	psychicPsycho CutpsychicFuture Sight+	6,428	0:17	0.09	0.0	2583.9%
4	Mega Raichu Yelectric	electricVolt SwitchelectricWild Charge	3,780	0:18	0.10	0.0	2421.9%
5	Mega Blazikenfirefighting	fightingCounterfightingAura Sphere	4,161	0:18	0.10	0.0	2411.9%
6	Mega Raichu Xelectric	electricThunder ShockelectricVolt Tackle+	3,510	0:19	0.10	0.0	2351.1%
7	Mega Galladepsychicfighting	fightingLow KickfightingSacred Sword	4,521	0:19	0.11	0.0	2301.7%
8	Keldeowaterfighting	fightingLow KickfightingSecret Sword	3,698	0:19	0.11	0.0	2261.1%
9	Lucariofightingsteel	fightingForce PalmfightingAura Sphere	2,703	0:19	0.11	0.0	2249.5%
10	Thundurus (Therian)electricflying	electricVolt SwitchelectricWildbolt Storm	3,659	0:19	0.11	0.1	2247.7%
11	Regielekielectric	electricThunder ShockelectricThunder Cage	2,803	0:19	0.11	0.0	2244.8%
12	Shadow Raikouelectric	electricThunder ShockfightingAura Sphere	3,452	0:20	0.11	0.0	2208.4%
13	Shadow Blazikenfirefighting	fightingCounterfightingAura Sphere	2,848	0:20	0.11	0.3	2186.1%
14	Shadow Conkeldurrfighting	fightingForce PalmfightingFocus Blast	3,337	0:20	0.11	0.0	2179.7%
15	Kartanagrasssteel	grassRazor LeaffightingSacred Sword	3,677	0:20	0.11	0.0	2164.6%

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 Cloyster.

Estimator is how many trainers of this strength the fight needs. Power is the share of Cloyster'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	Faints	Estimator
Random (any moveset)showing	100%	456%	2382.6%	0:18	0.0	0.10
Frost Breath / Aurora Beam	100%	461%	2304.0%	0:19	0.1	0.11
Ice Shard / Aurora Beam	100%	476%	2311.6%	0:19	0.1	0.11
Frost Breath / Avalanche	100%	416%	2344.5%	0:19	0.1	0.10
Ice Shard / Avalanche	100%	428%	2352.4%	0:19	0.1	0.10
Ice Shard / Icy Wind	100%	496%	2356.5%	0:18	0.0	0.10
Frost Breath / Icy Wind	100%	483%	2358.2%	0:18	0.0	0.10
Frost Breath / Razor Shell	100%	432%	2373.4%	0:18	0.0	0.10
Ice Shard / Razor Shell	100%	447%	2377.9%	0:18	0.0	0.10
Ice Shard / Liquidation	100%	469%	2383.3%	0:18	0.0	0.10
Frost Breath / Liquidation	100%	459%	2383.3%	0:18	0.0	0.10
Frost Breath / Hydro Pump	100%	460%	2383.9%	0:18	0.0	0.10
Ice Shard / Hydro Pump	100%	480%	2386.6%	0:18	0.0	0.10

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…

Cloyster 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 rock1.6x grass1.6x electric1.6x normal1x flying1x poison1x ground1x bug1x ghost1x steel1x fire1x psychic1x dragon1x dark1x fairy1x water0.63x ice0.39x

Weak (4)
Neutral (12)
Resists (2)

It resists ice0.39xwater0.625x— bringing one of those is throwing damage away.

What Cloyster throws at you

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

Fast moves

Move	Power	Energy	Duration	Hits at
iceFrost BreathSTAB	11	+9	1.0s	0.55s
iceIce ShardSTAB	10	+10	1.0s	0.40s

Charged moves

Move	Power	Energy	Duration	Hits at
waterHydro PumpSTAB	135	-100	3.5s	1.10s
waterRazor ShellSTAB	55	-33	1.5s	0.85s
iceAvalancheSTAB	85	-50	2.5s	1.50s
waterLiquidationSTAB	70	-33	3.0s	2.00s
iceAurora BeamSTAB	80	-50	3.5s	3.30s
iceIcy WindSTAB	65	-33	3.5s	2.20s

Catch CP

What the encounter after the fight can hand you.

IV spread	CP at L20	CP at L25 (weather boosted)
10/10/10floor	1,383	1,729
11/11/11	1,397	1,747
12/12/12	1,412	1,765
13/13/13	1,426	1,783
14/14/14	1,441	1,801
15/15/15hundo	1,455	1,819

Caught CP range 1,383 - 1,455, or 1,729 - 1,819 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.

Cloyster 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 120 / Defense 161 (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	Faints	Win % (1)	CP	DPS	TDO
1	Mega Mewtwo X psychicfightingmega Counter / Dynamic Punch+	Counter / Dynamic Punch++26 more movesets	100%	3379.4%	0.07	0:13	0.0	100%	6,112	48.1	619
2	Mega Lucario fightingsteelmega Force Palm / Aura Sphere	Force Palm / Aura Sphere+23 more movesets	79%	2906.4%	0.08	0:15	0.0	100%	3,826	40.2	603
3	Mega Mewtwo Y psychicmega Psycho Cut / Future Sight+	Psycho Cut / Future Sight++26 more movesets	72%	2583.9%	0.09	0:17	0.0	100%	6,428	36.9	622
4	Mega Raichu Y electricmega Volt Switch / Wild Charge	Volt Switch / Wild Charge+35 more movesets	59%	2421.9%	0.10	0:18	0.0	100%	3,780	33.9	610
5	Mega Blaziken firefightingmega Counter / Aura Sphere	Counter / Aura Sphere+20 more movesets	62%	2411.9%	0.10	0:18	0.0	100%	4,161	37.2	658
6	Mega Raichu X electricmega Thunder Shock / Volt Tackle+	Thunder Shock / Volt Tackle++35 more movesets	62%	2351.1%	0.10	0:19	0.0	100%	3,510	41.5	769
7	Mega Gallade psychicfightingmega Low Kick / Sacred Sword	Low Kick / Sacred Sword+19 more movesets	59%	2301.7%	0.11	0:19	0.0	100%	4,521	32.9	623
8	Keldeo waterfighting Low Kick / Secret Sword	Low Kick / Secret Sword+11 more movesets	63%	2261.1%	0.11	0:19	0.0	100%	3,698	33.8	651
9	Lucario fightingsteel Force Palm / Aura Sphere	Force Palm / Aura Sphere+23 more movesets	56%	2249.5%	0.11	0:19	0.0	100%	2,703	31.4	609
10	Thundurus (Therian) electricflying Volt Switch / Wildbolt Storm	Volt Switch / Wildbolt Storm+9 more movesets	53%	2247.7%	0.11	0:19	0.1	100%	3,659	31.9	596
11	Regieleki electric Thunder Shock / Thunder Cage	Thunder Shock / Thunder Cage+11 more movesets	55%	2244.8%	0.11	0:19	0.0	100%	2,803	34.7	672
12	Shadow Raikou electricshadow Thunder Shock / Aura Sphere	Thunder Shock / Aura Sphere+9 more movesets	55%	2208.4%	0.11	0:20	0.0	100%	3,452	31.5	621
13	Shadow Blaziken firefightingshadow Counter / Aura Sphere	Counter / Aura Sphere+20 more movesets	52%	2186.1%	0.11	0:20	0.3	100%	2,848	34.0	582
14	Shadow Conkeldurr fightingshadow Force Palm / Focus Blast	Force Palm / Focus Blast+11 more movesets	53%	2179.7%	0.11	0:20	0.0	100%	3,337	30.2	603
15	Kartana grasssteel Razor Leaf / Sacred Sword	Razor Leaf / Sacred Sword+14 more movesets	52%	2164.6%	0.11	0:20	0.0	100%	3,677	29.9	596
16	Shadow Thundurus (Therian) electricflyingshadow Volt Switch / Wildbolt Storm	Volt Switch / Wildbolt Storm+9 more movesets	51%	2163.2%	0.11	0:20	0.2	100%	3,659	37.7	667
17	Shadow Zapdos electricflyingshadow Thunder Shock / Zap Cannon	Thunder Shock / Zap Cannon+11 more movesets	50%	2134.8%	0.11	0:20	0.1	100%	3,527	29.8	581
18	Zeraora electric Volt Switch / Plasma Fists	Volt Switch / Plasma Fists+9 more movesets	54%	2133.8%	0.11	0:20	0.0	100%	3,419	30.4	620
19	Mega Falinks fightingmega Counter / Brick Break+	Counter / Brick Break++7 more movesets	53%	2133.2%	0.11	0:20	0.0	100%	3,670	30.5	622
20	Shadow Gigalith rockshadow Lock-On / Meteor Beam	Lock-On / Meteor Beam+14 more movesets	52%	2130.5%	0.11	0:20	0.0	100%	3,228	30.8	615
21	Mega Sceptile grassdragonmega Bullet Seed / Frenzy Plant	Bullet Seed / Frenzy Plant+11 more movesets	49%	2119.9%	0.11	0:21	0.3	100%	4,056	30.2	506
22	Shadow Gallade psychicfightingshadow Low Kick / Sacred Sword	Low Kick / Sacred Sword+19 more movesets	51%	2109.9%	0.12	0:21	0.0	100%	3,093	30.5	618
23	Mega Chesnaught grassfightingmega Vine Whip / Seed Bomb+	Vine Whip / Seed Bomb++20 more movesets	57%	2100.7%	0.12	0:21	0.0	100%	4,093	36.6	758
24	Shadow Rampardos rockshadow Smack Down / Rock Slide	Smack Down / Rock Slide+5 more movesets	47%	2091.0%	0.12	0:21	0.3	100%	3,298	31.7	542
25	Shadow Mewtwo psychicshadow Counter / Thunderbolt	Counter / Thunderbolt+23 more movesets	51%	2085.8%	0.12	0:21	0.0	100%	4,178	29.9	625
26	Shadow Machamp fightingshadow Counter / Dynamic Punch	Counter / Dynamic Punch+23 more movesets	49%	2081.9%	0.12	0:21	0.1	100%	3,056	29.3	588
27	Mega Latios dragonpsychicmega Dragon Breath / Aura Sphere	Dragon Breath / Aura Sphere+9 more movesets	52%	2071.0%	0.12	0:21	0.0	100%	5,007	29.6	622
28	Mega Heracross bugfightingmega Counter / Upper Hand	Counter / Upper Hand+17 more movesets	52%	2070.0%	0.12	0:21	0.0	100%	4,814	29.3	616
29	Shadow Electivire electricshadow Thunder Shock / Wild Charge	Thunder Shock / Wild Charge+9 more movesets	49%	2041.4%	0.12	0:21	0.0	100%	3,079	31.5	665
30	Shadow Sceptile grassshadow Fury Cutter / Frenzy Plant	Fury Cutter / Frenzy Plant+11 more movesets	45%	2009.2%	0.12	0:22	0.3	100%	2,757	27.9	519

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.