Is Cloyster viable in Gen 1 OU?

Cloyster is ranked #11 in Gen 1 OU with 17.24% usage according to Smogon May 2026 - Jul 2026 data.

What beats Cloyster in Gen 1 OU?

Starmie has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 53.0% of 169.27289379584215 relevant encounters. Standard error is 6.6 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 · Sorted by p − 4 standard errors · Smogon source period May 2026 - Jul 2026 · Generated 2026-08-05

#0091 Cloyster

WaterIce

USAGE 17.2% #11

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% Blizzard 91.7% Rest 90.3% Ice Beam 8.3% Hyper Beam 7.0% Double-Edge 2.1% Toxic 1.0%

Common Teammates

Browse Gen 1 OU teams using Cloyster →

Explore Cloyster + Starmie teams 27 score Explore Cloyster + Tauros teams 6 score Explore Cloyster + Cloyster teams 1 score Explore Cloyster + Exeggutor teams -1 score Explore Cloyster + Chansey teams -2 score Explore Cloyster + Snorlax 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 90.8% 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

169.273

26.6

53.0% Standard error 6.59 points

Tauros

Normal SOFT CHECK View matchup

121.124

5.7

35.8% Standard error 7.52 points

Cloyster

WaterIce SOFT CHECK View matchup

22.698

0.7

42.2% Standard error 10.36 points

Exeggutor

GrassPsychic SOFT CHECK View matchup

86.921

-0.8

33.0% Standard error 8.46 points

Chansey

Normal SOFT CHECK View matchup

122.604

-2.2

24.5% Standard error 6.68 points

Snorlax

Normal SOFT CHECK View matchup

181.209

-4.4

11.6% Standard error 4.01 points

Jynx

IcePsychic SOFT CHECK View matchup

44.647

-7.7

31.6% Standard error 9.84 points

Ranked #11 with 17.24% usage. Sorted by conservative score.