Is Rotom-Wash viable in Gen 4 OU?

Rotom-Wash is ranked #8 in Gen 4 OU with 20.03% usage according to Smogon Jul 2026 - Sep 2026 data.

What beats Rotom-Wash in Gen 4 OU?

Tyranitar has the strongest conservative score in this observed Jul 2026 - Sep 2026 sample. The target was knocked out or switched out in 75.9% of 49.79991566044472 relevant encounters. Standard error is 6.1 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 · Smogon source period Jul 2026 - Sep 2026

#0479 Rotom-Wash

ElectricWater

USAGE 20.0% #8

ABILITYLevitate

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 88.1% Shadow Ball 66.1% Trick 56.1% Hidden Power Ice 37.4% Will-O-Wisp 30.9% Pain Split 30.3% Substitute 24.2% Hydro Pump 23.7%

Items

Choice Scarf 53.7% Leftovers 36.6% Life Orb 5.1% Choice Specs 3.0% Magnet 0.6% Wise Glasses 0.6% Damp Rock 0.2% Colbur Berry 0.1%

Abilities

Levitate100.0%

Common Teammates

Browse Gen 4 OU teams using Rotom-Wash →

Explore Rotom-Wash + Tyranitar teams 52 score Explore Rotom-Wash + Latias teams 34 score Explore Rotom-Wash + Jirachi teams 16 score Explore Rotom-Wash + Clefable teams 15 score Explore Rotom-Wash + Gyarados teams -16 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 64.9% 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

49.8

51.6

75.9% Standard error 6.06 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

43.159

34.1

63.4% Standard error 7.33 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 →

Jirachi

SteelPsychic SOFT CHECK View matchup

45.325

15.7

45.2% Standard error 7.39 points

DAMAGE CALC

252+ Atk Jirachi Fire Punch vs. 252 HP / 0 Def Rotom-Wash: 71-84 (23.3 - 27.6%) -- 75% chance to 4HKO

View Jirachi counters → Teams with Jirachi →

Clefable

Fairy SOFT CHECK View matchup

27.252

15.0

53.2% Standard error 9.56 points

DAMAGE CALC

0- SpA Clefable Ice Beam vs. 252 HP / 252+ SpD Rotom-Wash: 37-44 (12.1 - 14.4%) -- possible 7HKO

View Clefable counters → Teams with Clefable →

Gyarados

WaterFlying SOFT CHECK View matchup

20.156

-15.5

20.4% Standard error 8.97 points

DAMAGE CALC

252+ Atk Gyarados Waterfall vs. 252 HP / 0 Def Rotom-Wash: 132-156 (43.4 - 51.3%) -- 4.7% chance to 2HKO

View Gyarados counters → Teams with Gyarados →

Ranked #8 with 20.03% usage. Sorted by conservative score.