Who to bring
CP 1326–1455
† Legacy move (Elite TM) · Mega-only move
Weak to1.6x1.6x1.6x1.6x
Cloyster against every one of the 18 attacking types. GO multipliers: 1.6x super effective, 2.56x doubly, 0.625x resisted, 0.39x doubly resisted.
It resists 0.39x0.625x— bringing one of those is throwing damage away.
What the encounter after the fight can hand you.
| IV spread | CP at L20 | CP at L25 (weather boosted) |
|---|---|---|
| 6/6/6floor | 1,326 | 1,658 |
| 7/7/7 | 1,340 | 1,675 |
| 8/8/8 | 1,354 | 1,693 |
| 9/9/9 | 1,368 | 1,711 |
| 10/10/10 | 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 1,326 - 1,455, or 1,658 - 1,819 when the weather boosts it.
A raid encounter is level 20 (level 25 weather boosted) and cannot roll an IV below 6/6/6 — a Shadow raid's floor is 6, not the usual 10. Anything outside the first range is not this raid's reward.
Shadow raid floor. A Shadow Raid encounter rolls a minimum of 6/6/6, so this band starts at 1,326, not at the 1,383 a 10/10/10 catch would give. pokebattler.com's own page for a Shadow boss prints that 10/10/10 value as its floor — it is applying the standard-raid rule — so expect its range to start 57 CP higher than this one.
What Cloyster throws at you: its standard movepool, with the damage window a dodge has to beat.
| Move | Power | Energy | Duration | Hits at |
|---|---|---|---|---|
| Frost BreathSTAB | 11 | +9 | 1.0s | 0.55s |
| Ice ShardSTAB | 10 | +10 | 1.0s | 0.40s |
| Move | Power | Energy | Duration | Hits at |
|---|---|---|---|---|
| Hydro PumpSTAB | 135 | -100 | 3.5s | 1.10s |
| Razor ShellSTAB | 55 | -33 | 1.5s | 0.85s |
| AvalancheSTAB | 85 | -50 | 2.5s | 1.50s |
| LiquidationSTAB | 70 | -33 | 3.0s | 2.00s |
| Aurora Beam |
Simulating each boss moveset…
A Shadow raid boss hits harder than its normal form (Shadow Frenzy), and the Pokemon you catch afterwards is a Shadow. Purified Gems weaken it mid-fight; the simulation does not use them.
Beating Shadow Cloyster should take 1 trainer with level 40 counters. Caught CP 1,326-1,455.
Type a name, then Enter or click a result
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.
The chevron on the top 15 opens damage per move, breakpoints and the energy cycle. Every column (CP, faints, power, pokebattler.com's own rank) is under All settings.
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% | 225% | 1380.9% | 0:32 | 0.6 | 0.18 |
| Frost Breath / Hydro Pump | 100% | 212% | 1315.6% | 0:33 | 0.8 | 0.18 |
| Ice Shard / Hydro Pump |
Shadow Tier 1: 600 HP, 3:00 timer, boss Attack 120 / Defense 161 (15/15/15 at tier CPM 0.5974).
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  megaCounter / Dynamic Punch+ | Counter / Dynamic Punch++26 more movesets | 100% | 1951.2% | 0.12 | 0:22 | 0.0 | 100% | 6,112 | 29.7 | 663 |
| 2 | Mega Blaziken  megaCounter / Aura Sphere | Counter / Aura Sphere+20 more movesets | 71% | 1548.2% | 0.16 | 0:28 | 0.4 | 100% | 4,161 | 21.6 | 476 |
| 3 | Mega Lucario  megaForce Palm / Aura Sphere | Force Palm / Aura Sphere+23 more movesets | 71% | 1514.5% | 0.16 | 0:29 | 0.3 | 100% | 3,826 | 22.8 | 574 |
| 4 | Mega Raichu X megaThunder Shock / Volt Tackle+ | Thunder Shock / Volt Tackle++35 more movesets | 68% | 1467.7% | 0.17 | 0:30 | 0.3 | 100% | 3,510 | 23.3 | 586 |
| 5 | Keldeo Low Kick / Secret Sword | Low Kick / Secret Sword+11 more movesets | 70% | 1408.9% | 0.17 | 0:31 | 0.0 | 100% | 3,698 | 19.8 | 613 |
| 6 | Mega Mewtwo Y megaCounter / Future Sight+ | Counter / Future Sight++26 more movesets | 67% | 1403.7% | 0.17 | 0:31 | 0.0 | 100% | 6,428 | 19.6 | 597 |
| 7 | Mega Chesnaught megaVine Whip / Seed Bomb+ | Vine Whip / Seed Bomb++20 more movesets | 66% | 1377.1% | 0.18 | 0:32 | 0.1 | 100% | 4,093 | 21.2 | 620 |
| 8 | Mega Gallade megaLow Kick / Sacred Sword | Low Kick / Sacred Sword+19 more movesets | 61% | 1353.4% | 0.18 | 0:32 | 0.5 | 100% | 4,521 | 18.9 | 462 |
| 9 | Mega Raichu Y megaVolt Switch / Zap Cannon+ | Volt Switch / Zap Cannon++35 more movesets | 58% | 1328.4% | 0.18 | 0:33 | 0.9 | 100% | 3,780 | 20.9 | 380 |
| 10 | Mega Falinks megaCounter / Brick Break+ | Counter / Brick Break++7 more movesets | 60% | 1310.2% | 0.19 | 0:33 | 0.4 | 100% | 3,670 | 19.6 | 528 |
| 11 | Mega Sceptile  megaFury Cutter / Frenzy Plant | Fury Cutter / Frenzy Plant+11 more movesets | 53% | 1309.2% | 0.19 | 0:33 | 1.0 | 100% | 4,056 | 18.4 | 367 |
| 12 | Shadow Thundurus (Therian)  shadowVolt Switch / Wildbolt Storm | Volt Switch / Wildbolt Storm+9 more movesets | 54% | 1298.8% | 0.19 | 0:34 | 1.1 | 100% | 3,659 | 19.7 | 309 |
| 13 | Shadow Blaziken shadowCounter / Aura Sphere | Counter / Aura Sphere+20 more movesets | 54% | 1278.7% | 0.19 | 0:34 | 1.0 | 100% | 2,848 | 18.7 | 395 |
| 14 | Shadow Gallade shadowLow Kick / Sacred Sword | Low Kick / Sacred Sword+19 more movesets | 55% | 1272.8% | 0.19 | 0:34 | 0.8 | 100% | 3,093 | 17.9 | 361 |
| 15 | Lucario Force Palm / Aura Sphere | Force Palm / Aura Sphere+23 more movesets | 56% | 1272.3% | 0.19 | 0:34 | 0.5 | 100% | 2,703 | 17.9 | 445 |
| 16 | Regieleki Thunder Shock / Thunder Cage | Thunder Shock / Thunder Cage+11 more movesets | 53% | 1255.7% | 0.19 | 0:35 | 0.9 | 100% | 2,803 | 17.5 | 334 |
| 17 | Shadow Electivire shadowThunder Shock / Wild Charge | Thunder Shock / Wild Charge+9 more movesets | 53% | 1249.3% | 0.19 | 0:35 | 0.9 | 100% | 3,079 | 17.5 | 330 |
| 18 | Shadow Raikou shadowThunder Shock / Wild Charge | Thunder Shock / Wild Charge+9 more movesets | 54% | 1235.5% | 0.20 | 0:35 | 0.7 | 100% | 3,452 | 17.2 | 394 |
| 19 | Mega Diancie  megaRock Throw / Rock Slide | Rock Throw / Rock Slide+5 more movesets | 51% | 1219.8% | 0.20 | 0:36 | 0.8 | 100% | 4,346 | 16.9 | 354 |
| 20 | Mega Heracross  megaCounter / Upper Hand | Counter / Upper Hand+17 more movesets | 54% | 1207.9% | 0.20 | 0:36 | 0.4 | 100% | 4,814 | 16.8 | 465 |
| 21 | Xurkitree Thunder Shock / Discharge | Thunder Shock / Discharge+7 more movesets | 51% | 1191.0% | 0.20 | 0:37 | 0.9 | 100% | 3,937 | 16.6 | 334 |
| 22 | Kartana Razor Leaf / Sacred Sword | Razor Leaf / Sacred Sword+14 more movesets | 51% | 1186.7% | 0.20 | 0:37 | 0.8 | 100% | 3,677 | 16.6 | 346 |
| 23 | Shadow Rampardos shadowSmack Down / Rock Slide | Smack Down / Rock Slide+5 more movesets | 47% | 1183.9% | 0.21 | 0:37 | 1.5 | 100% | 3,298 | 16.9 | 261 |
| 24 | Shadow Conkeldurr shadowForce Palm / Dynamic Punch | Force Palm / Dynamic Punch+11 more movesets | 52% | 1183.0% | 0.21 | 0:37 | 0.8 | 100% | 3,337 | 17.6 | 376 |
| 25 | Mega Latios megaDragon Breath / Aura Sphere | Dragon Breath / Aura Sphere+9 more movesets | 53% | 1182.4% | 0.21 | 0:37 | 0.4 | 100% | 5,007 | 16.5 | 479 |
| 26 | Terrakion Double Kick / Sacred Sword | Double Kick / Sacred Sword+11 more movesets | 51% | 1174.0% | 0.21 | 0:37 | 0.8 | 100% | 3,698 | 16.5 | 382 |
| 27 | Zekrom Charge Beam / Fusion Bolt | Charge Beam / Fusion Bolt+9 more movesets | 51% | 1172.2% | 0.21 | 0:37 | 0.4 | 100% | 4,038 | 16.3 | 473 |
| 28 | Shadow Magnezone shadowSpark / Wild Charge | Spark / Wild Charge+15 more movesets | 52% | 1166.1% | 0.21 | 0:37 | 0.5 | 100% | 3,205 | 16.5 | 442 |
| 29 | Shadow Machamp shadowKarate Chop / Dynamic Punch | Karate Chop / Dynamic Punch+23 more movesets | 48% | 1145.5% | 0.21 | 0:38 | 0.9 | 100% | 3,056 | 16.1 | 329 |
| 30 | Shadow Luxray shadowSpark / Wild Charge | Spark / Wild Charge+14 more movesets | 47% | 1142.9% | 0.21 | 0:38 | 1.0 | 100% | 2,888 | 15.9 | 309 |
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%.
This boss on pokebattler.com (its Shadow boss page; the ordinary boss's page is a different, easier fight). Boss-by-boss accuracy report.
Ranked 30 attackers in 0.2 s (50 Monte Carlo runs each, seed 1). Same boss on pokebattler.com. The same ranking as JSON: /api/raids/rank.
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+.
| 80 |
| -50 |
| 3.5s |
| 3.30s |
| Icy WindSTAB | 65 | -33 | 3.5s | 2.20s |
| 100% |
| 213% |
| 1316.8% |
| 0:33 |
| 0.8 |
| 0.18 |
| Ice Shard / Avalanche | 100% | 213% | 1386.6% | 0:31 | 0.6 | 0.18 |
| Ice Shard / Razor Shell | 100% | 223% | 1388.4% | 0:31 | 0.6 | 0.18 |
| Ice Shard / Icy Wind | 100% | 257% | 1389.7% | 0:31 | 0.3 | 0.17 |
| Frost Breath / Avalanche | 100% | 212% | 1391.6% | 0:31 | 0.6 | 0.17 |
| Frost Breath / Liquidation | 100% | 223% | 1395.1% | 0:31 | 0.6 | 0.17 |
| Frost Breath / Icy Wind | 100% | 255% | 1398.6% | 0:31 | 0.3 | 0.17 |
| Ice Shard / Liquidation | 100% | 226% | 1400.1% | 0:31 | 0.6 | 0.17 |
| Frost Breath / Razor Shell | 100% | 224% | 1404.2% | 0:31 | 0.6 | 0.17 |
| Ice Shard / Aurora Beam | 100% | 242% | 1408.3% | 0:31 | 0.4 | 0.17 |
| Frost Breath / Aurora Beam | 100% | 240% | 1410.3% | 0:31 | 0.4 | 0.17 |
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.
