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.
Cloyster is weak to fighting1.6xrock1.6xgrass1.6xelectric1.6x
- Weak (4)
- Neutral (12)
- Resists (2)
It resists ice0.39xwater0.625x— bringing one of those is throwing damage away.
Best Cloyster counters
Beating Cloyster should take 2 trainers with Pokemon of this strength. Difficulty rating 1.77 with the best counter, 5:10 to win.
| # | Attacker | Moveset | ||||||
|---|---|---|---|---|---|---|---|---|
| 1 |  Lucariofightingsteeljoint top pick | fightingForce PalmfightingAura Sphere | 2,703 | 5:10 | 1.77 | 5.8 | 75.7% | |
| 2 |  Conkeldurrfighting | fightingForce PalmfightingDynamic Punch | 3,337 | 6:05 | 2.08 | 5.9 | 64.3% | |
| 3 |  Electivireelectric | electricThunder ShockelectricWild Charge | 3,079 | 6:03 | 2.07 | 6.0 | 64.6% | |
| 4 |  Blazikenfirefighting | fightingCounterfightingAura Sphere | 2,848 | 6:00 | 2.05 | 5.7 | 65.1% | |
| 5 |  Magnezoneelectricsteel | electricSparkelectricWild Charge | 3,205 | 6:25 | 2.19 | 5.1 | 61.0% | |
| 6 |  Galladepsychicfighting | fightingLow KickfightingSacred Sword | 3,093 | 6:13 | 2.13 | 6.0 | 62.8% | |
| 7 |  Hisuian Decidueyegrassfighting | grassMagical LeaffightingAura Sphere | 2,897 | 6:10 | 2.11 | 5.7 | 63.5% | |
| 8 |  Meowscaradagrassdark | grassLeafagegrassFrenzy Plant | 2,825 | 6:07 | 2.09 | 6.0 | 63.9% | |
| 9 |  Rillaboomgrass | grassRazor LeafgrassFrenzy Plant | 3,324 | 6:23 | 2.18 | 5.7 | 61.2% | |
| 10 |  Glimmorarockpoison | rockRock ThrowrockMeteor Beam | 3,273 | 6:20 | 2.16 | 6.0 | 61.8% | |
| 11 |  Luxrayelectric | electricSparkelectricWild Charge | 2,888 | 6:31 | 2.23 | 6.0 | 60.0% | |
| 12 |  Machampfighting | fightingKarate ChopfightingDynamic Punch | 3,056 | 6:37 | 2.26 | 6.0 | 59.2% |
Ordered by Overall, pokebattler.com's own default — a blend of how fast the fight ends and how many of your six go down. Click any numeric column heading to re-order on that column alone.
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 boss rolls one of these 12 pairings, and it changes the fight. Each row re-runs the top 6 counters against that single moveset.
| # | Boss moveset | Time to win | Estimator | Faints | Win % |
|---|---|---|---|---|---|
| 1 | iceFrost Breath+waterHydro Pumphardest | 6:17 | 2.14 | 6.0 | 100% |
| 2 | iceIce Shard+waterHydro Pump | 6:15 | 2.14 | 6.0 | 100% |
| 3 | iceIce Shard+waterRazor Shell | 6:01 | 2.06 | 6.0 | 100% |
| 4 | iceIce Shard+waterLiquidation | 6:00 | 2.05 | 6.0 | 100% |
| 5 | iceFrost Breath+waterRazor Shell | 6:00 | 2.05 | 6.0 | 100% |
| 6 | iceFrost Breath+waterLiquidation | 6:00 | 2.05 | 6.0 | 100% |
| 7 | iceFrost Breath+iceAvalanche | 5:57 | 2.03 | 5.9 | 100% |
| 8 | iceIce Shard+iceAvalanche | 5:57 | 2.03 | 5.9 | 100% |
| 9 | iceFrost Breath+iceAurora Beam | 5:52 | 2.00 | 5.6 | 93% |
| 10 | iceIce Shard+iceAurora Beam | 5:51 | 2.00 | 5.5 | 93% |
| 11 | iceIce Shard+iceIcy Wind | 5:50 | 1.99 | 5.0 | 94% |
| 12 | iceFrost Breath+iceIcy Wind | 5:50 | 1.99 | 5.2 | 88% |
A raid boss rolls only its standard movepool — never a legacy or Elite TM move, verified against Pokebattler's own per-moveset list for six reference bosses. The ranked table above averages over all of these, which is what Pokebattler's DEFENSE_RANDOM_MC means.
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) |
|---|---|---|
| 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. LeekDuck's published band agrees with the table above.
When it is in raids
Read from the committed LeekDuck rotation snapshot, fetched 2026-10-05.
Cloyster is not in the current rotation snapshot. The simulation below is still exact for the tier chosen above — Pokebattler simulates any defender you name, current boss or not.
Boss stats
How the numbers in the header are built.
| Header number | Worked out | Value | Inputs from |
|---|---|---|---|
| Attack | floor((186 + 15) x 0.76) | 152 | Game Master base Attack, tier CPM |
| Defense | floor((256 + 15) x 0.76) | 205 | Game Master base Defense, tier CPM |
| HP | 4,000 — fixed by tier, base Stamina 137 unused | 4,000 | tier HP pool |
| Lobby CP | floor((186 + 15) x sqrt(256 + 15) x sqrt(4,000) / 10) — no CPM term | 20,927 | Game Master base stats, tier HP pool |
A raid boss uses 15/15/15 IVs, its tier's CP multiplier and its tier's fixed HP pool — stamina does nothing, which is why the same species is a different fight at every tier. Every tier constant above (CPM 0.76, 4,000 HP, 180s timer) is copied from Pokebattler's own published /raids tier table into src/engine/constants.ts, with the source named there.
Cloyster's own Pokemon page has its full movepool, evolution family, stat ranks and what it is good against as an attacker.