Is Rotom-Wash viable in Gen 4 OU?

Rotom-Wash is ranked #15 in Gen 4 OU with 15.76% usage according to Smogon May 2026 - Jul 2026 data.

What beats Rotom-Wash in Gen 4 OU?

Tyranitar has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 73.9% of 48.1403952661111 relevant encounters. Standard error is 8.7 points. Sets and switch conditions can change the result.

How are Rotom-Wash matchup checks ranked in Gen 4 OU?

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

Rotom-Wash counters

Gen 4 OU · Sorted by p − 4 standard errors · Smogon source period May 2026 - Jul 2026 · Generated 2026-08-05

#0479 Rotom-Wash

ElectricWater

USAGE 15.8% #15

BASE STATS

HP 50

ATK 65

DEF 107

SPA 105

SPD 107

SPE 86

BST520

TYPE MATCHUPS

2×

GrassGround

½×

FireWaterIceFlying

¼×

Steel

Moves

Thunderbolt 87.8% Shadow Ball 58.2% Trick 41.7% Will-O-Wisp 36.2% Pain Split 34.2% Hydro Pump 28.8% Substitute 25.8% Hidden Power Ice 23.1%

Items

Leftovers 46.2% Choice Scarf 41.0% Life Orb 8.0% Choice Specs 2.5% Damp Rock 0.9% Magnet 0.8% Colbur Berry 0.4% Kasib Berry 0.2%

Common Teammates

Browse Gen 4 OU teams using Rotom-Wash →

Explore Rotom-Wash + Tyranitar teams 39 score Explore Rotom-Wash + Latias teams 26 score Explore Rotom-Wash + Clefable teams 15 score Explore Rotom-Wash + Jirachi teams 2 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

Rotom-Wash + Latias 60.9% 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

Tyranitar

RockDark OFFENSIVE CHECK View matchup

48.14

39.1

73.9% Standard error 8.70 points

DAMAGE CALCSand

252+ Atk Choice Band Tyranitar Crunch vs. 252 HP / 0 Def Rotom-Wash: 416-492 (136.8 - 161.8%) -- guaranteed OHKO

View Tyranitar counters → Teams with Tyranitar →

Latias

DragonPsychic DEFENSIVE CHECK View matchup

46.878

26.0

65.3% Standard error 9.82 points

DAMAGE CALC

252+ SpA Rotom-Wash Shadow Ball vs. 252 HP / 252+ SpD Latias: 150-176 (41.2 - 48.3%) -- guaranteed 3HKO

View Latias counters → Teams with Latias →

Clefable

Fairy SOFT CHECK View matchup

27.252

15.0

53.2% Standard error 9.56 points

DAMAGE CALC

252+ Atk Clefable Knock Off vs. 252 HP / 0 Def Rotom-Wash: 32-38 (10.5 - 12.5%) -- possible 8HKO

View Clefable counters → Teams with Clefable →

Jirachi

SteelPsychic SOFT CHECK View matchup

24.414

1.5

41.4% Standard error 9.97 points

DAMAGE CALC

252+ Atk Jirachi Fire Punch vs. 252 HP / 0 Def Rotom-Wash: 71-84 (23.3 - 27.6%) -- possible 5HKO

View Jirachi counters → Teams with Jirachi →

Ranked #15 with 15.76% usage. Sorted by conservative score.