Is Cloyster viable in Gen 1 OU?

Cloyster is ranked #11 in Gen 1 OU with 16.13% usage according to Smogon Jul 2026 - Sep 2026 data.

What beats Cloyster in Gen 1 OU?

Starmie has the strongest conservative score in this observed Jul 2026 - Sep 2026 sample. The target was knocked out or switched out in 53.7% of 159.96652918927424 relevant encounters. Standard error is 3.9 points. Sets and switch conditions can change the result.

How are Cloyster matchup checks ranked in Gen 1 OU?

They are ranked by p minus four standard errors. Here, p is the observed fraction of relevant encounters where Cloyster was knocked out or switched out. This is not a set-specific battle guarantee.

Cloyster counters

Gen 1 OU · Smogon source period Jul 2026 - Sep 2026

#0091 Cloyster

WaterIce

USAGE 16.1% #11

ABILITYNo Ability

BASE STATS

HP 50

ATK 95

DEF 180

SPA 85

SPD 45

SPE 70

BST525

TYPE MATCHUPS

2×

ElectricGrassFightingRock

½×

Water

¼×

Ice

Moves

Clamp 99.8% Explosion 98.9% Rest 89.3% Blizzard 82.6% Ice Beam 17.4% Hyper Beam 7.8% Toxic 1.7% Surf 1.2%

Abilities

No Ability100.0%

Common Teammates

Browse Gen 1 OU teams using Cloyster →

Explore Cloyster + Starmie teams 38 score Explore Cloyster + Jynx teams 19 score Explore Cloyster + Tauros teams 17 score Explore Cloyster + Chansey teams 10 score Explore Cloyster + Snorlax teams 4 score Explore Cloyster + Cloyster teams 4 score

Leading observed checks

Open a matchup for a separate set-based damage estimate, or browse uploaded teams with both Pokémon.

Team core to explore

Cloyster + Tauros 87.3% teammate usage Explore teams →

Checks & Counters

Observed target KO or switch rate is upstream p: the fraction of relevant encounters where the target was knocked out or switched out. Standard error is upstream d. The conservative score is p − 4d. These ladder observations do not prove a set-specific counter.

How to read this table

Use encounter count and standard error to judge the sample. Damage estimates below use inferred sets and remain separate from the observed ladder metric.

# Checker Encounters Conservative score Target KO or switch rate

Starmie

WaterPsychic SOFT CHECK View matchup

159.967

37.9

53.7% Standard error 3.94 points

Jynx

IcePsychic SOFT CHECK View matchup

56.386

19.4

46.0% Standard error 6.64 points

Tauros

Normal SOFT CHECK View matchup

153.44

16.6

31.6% Standard error 3.75 points

Chansey

Normal SOFT CHECK View matchup

133.949

9.6

24.5% Standard error 3.72 points

Snorlax

Normal SOFT CHECK View matchup

176.996

3.9

14.5% Standard error 2.65 points

Cloyster

WaterIce SOFT CHECK View matchup

28.869

3.7

40.2% Standard error 9.13 points

Exeggutor

GrassPsychic SOFT CHECK View matchup

51.541

0.6

24.6% Standard error 6.00 points

Ranked #11 with 16.13% usage. Sorted by conservative score.