Is Rillaboom viable in Gen 9 OU?

Rillaboom is ranked #35 in Gen 9 OU with 6.31% usage according to Smogon May 2026 - Jul 2026 data.

What beats Rillaboom in Gen 9 OU?

Dragonite has the strongest conservative score in this observed May 2026 - Jul 2026 sample. The target was knocked out or switched out in 73.4% of 61.51070887607081 relevant encounters. Standard error is 8.0 points. Sets and switch conditions can change the result.

How are Rillaboom matchup checks ranked in Gen 9 OU?

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

Rillaboom counters

Gen 9 OU · Sorted by p − 4 standard errors · Smogon source period May 2026 - Jul 2026 · Generated 2026-08-05

#0812 Rillaboom

Grass

USAGE 6.3% #35

ABILITYGrassy Surge

BASE STATS

HP 100

ATK 125

DEF 90

SPA 60

SPD 70

SPE 85

BST530

TYPE MATCHUPS

2×

FireIcePoisonFlyingBug

½×

WaterElectricGrassGround

Moves

Grassy Glide 99.7% Knock Off 98.1% Wood Hammer 55.4% Swords Dance 52.1% U-turn 46.9% High Horsepower 36.2% Taunt 4.5% Low Kick 4.2%

Items

Life Orb 39.6% Choice Band 24.0% Heavy-Duty Boots 10.6% Lum Berry 8.4% Terrain Extender 7.8% Assault Vest 3.5% Miracle Seed 2.5% Choice Scarf 2.1%

Abilities

Grassy Surge100.0%Overgrow0.0%

Tera Types

Grass 48.8% Dark 39.4% Fire 8.9% Ground 0.6% Poison 0.4% Steel 0.4% Electric 0.4% Fairy 0.3%

Common Teammates

Landorus-Therian13.5%

Browse Gen 9 OU teams using Rillaboom →

Explore Rillaboom + Dragonite teams 42 score Explore Rillaboom + Kyurem teams 39 score Explore Rillaboom + Zamazenta teams 34 score Explore Rillaboom + Gholdengo teams 17 score Explore Rillaboom + Corviknight teams 4 score Explore Rillaboom + Great Tusk 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

Rillaboom + Gholdengo 53.5% 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

Dragonite

DragonFlying OFFENSIVE CHECK View matchup

61.511

41.6

73.4% Standard error 7.96 points

DAMAGE CALCGrassy Terrain

252+ Atk Dragonite Ice Spinner vs. 252 HP / 0 Def Rillaboom: 214-254 (52.9 - 62.8%) -- 99.6% chance to 2HKO after Grassy Terrain recovery

View Dragonite counters → Teams with Dragonite →

Kyurem

DragonIce OFFENSIVE CHECK View matchup

26.312

38.8

73.3% Standard error 8.62 points

DAMAGE CALCGrassy Terrain

252+ SpA Kyurem Ice Beam vs. 252 HP / 252+ SpD Rillaboom: 290-344 (71.7 - 85.1%) -- guaranteed 2HKO after Grassy Terrain recovery

View Kyurem counters → Teams with Kyurem →

Zamazenta

Fighting OFFENSIVE CHECK View matchup

60.035

34.4

68.4% Standard error 8.48 points

DAMAGE CALCGrassy Terrain

252+ Atk Zamazenta Close Combat vs. 252 HP / 0 Def Rillaboom: 222-262 (54.9 - 64.8%) -- guaranteed 2HKO after Grassy Terrain recovery

View Zamazenta counters → Teams with Zamazenta →

Gholdengo

SteelGhost SOFT CHECK View matchup

27.516

16.7

54.6% Standard error 9.49 points

DAMAGE CALCGrassy Terrain

252+ SpA Gholdengo Make It Rain vs. 252 HP / 252+ SpD Rillaboom: 198-234 (49 - 57.9%) -- 56.3% chance to 2HKO after Grassy Terrain recovery

View Gholdengo counters → Teams with Gholdengo →

Corviknight

FlyingSteel SOFT CHECK View matchup

26.371

4.5

43.0% Standard error 9.64 points

DAMAGE CALCGrassy Terrain

252+ Atk Corviknight Brave Bird vs. 252 HP / 0 Def Rillaboom: 360-426 (89.1 - 105.4%) -- 31.3% chance to OHKO

View Corviknight counters → Teams with Corviknight →

Great Tusk

GroundFighting SOFT CHECK View matchup

64.769

4.2

37.7% Standard error 8.36 points

DAMAGE CALCGrassy Terrain

252+ Atk Great Tusk Close Combat vs. 252 HP / 0 Def Rillaboom: 237-280 (58.6 - 69.3%) -- guaranteed 2HKO after Grassy Terrain recovery

View Great Tusk counters → Teams with Great Tusk →

Gliscor

GroundFlying SOFT CHECK View matchup

68.957

1.4

33.4% Standard error 8.01 points

DAMAGE CALCGrassy Terrain

252+ Atk Gliscor Knock Off (97.5 BP) vs. 252 HP / 0 Def Rillaboom: 102-121 (25.2 - 29.9%) -- 0.1% chance to 4HKO after Grassy Terrain recovery

View Gliscor counters → Teams with Gliscor →

Ting-Lu

DarkGround SOFT CHECK View matchup

31.877

-11.1

7.4% Standard error 4.63 points

DAMAGE CALCGrassy Terrain

252+ Atk Ting-Lu Payback (100 BP) vs. 252 HP / 0 Def Rillaboom: 175-207 (43.3 - 51.2%) -- guaranteed 3HKO after Grassy Terrain recovery

View Ting-Lu counters → Teams with Ting-Lu →

Ogerpon-Wellspring

GrassWater SOFT CHECK View matchup

26.135

-11.7

18.9% Standard error 7.66 points

DAMAGE CALCGrassy Terrain

252+ Atk Wellspring Mask Ogerpon-Wellspring U-turn vs. 252 HP / 0 Def Rillaboom: 208-246 (51.4 - 60.8%) -- 92.6% chance to 2HKO after Grassy Terrain recovery

View Ogerpon-Wellspring counters → Teams with Ogerpon-Wellspring →

Ranked #35 with 6.31% usage. Sorted by conservative score.