Is Rillaboom viable in Gen 9 OU?

Rillaboom is ranked #36 in Gen 9 OU with 5.17% usage according to Smogon Apr 2026 - Jun 2026 data.

What beats Rillaboom in Gen 9 OU?

The best counter for Rillaboom in Gen 9 OU is Dragonite with a 74.3% win rate when they meet. Based on Smogon's Apr 2026 - Jun 2026 usage data, the top Pokémon that beat Rillaboom include Dragonite, Zamazenta, Gliscor, Great Tusk.

What is the best counter for Rillaboom in Gen 9 OU?

Dragonite is the best counter for Rillaboom in Gen 9 OU, KOing or forcing it out in 74.3% of their encounters.

Rillaboom counters

Gen 9 OU · Sorted by reliability score · Smogon · Apr 2026 - Jun 2026

#0812 Rillaboom

Grass

USAGE 5.2% #36

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 99.6% Knock Off 95.8% Wood Hammer 62.4% U-turn 50.6% Swords Dance 48.9% High Horsepower 29.2% Low Kick 5.1% Drain Punch 1.9%

Items

Life Orb 31.0% Choice Band 20.9% Terrain Extender 10.2% Heavy-Duty Boots 9.7% Lum Berry 9.2% Assault Vest 6.8% Miracle Seed 6.1% Choice Scarf 4.0%

Abilities

Grassy Surge100.0%Overgrow0.0%

Tera Types

Grass 56.2% Dark 28.9% Fire 9.5% Electric 1.5% Fairy 0.9% Poison 0.7% Ground 0.6% Fighting 0.5%

Common Teammates

Landorus-Therian21.2%

Raging Bolt18.4%

Glimmora16.1%

Dragapult15.2%

Browse Gen 9 OU teams using Rillaboom →

Teams using Dragonite 74% Teams using Zamazenta 66% Teams using Gliscor 36% Teams using Great Tusk 30%

Checks & Counters

Reliability ranks observed matchups; KO rate is how often the checker knocked out or forced out the target. “Checker faints” reports the checker's own observed death rate. Categories use matchup reliability plus offensive and defensive base stats.

How to read this table

Use encounter count to judge sample size. A high-reliability check with a modest KO rate can still be useful when it consistently forces switches or limits the target.

# Checker Encounters Reliability KO Rate

Dragonite

DragonFlying OFFENSIVE CHECK

33.868

74.3% checker faints 7.51%

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 →

Zamazenta

Fighting OFFENSIVE CHECK

27.87

66.3% checker faints 8.95%

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 →

Gliscor

GroundFlying SOFT CHECK

28.92

35.9% checker faints 8.92%

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 →

Great Tusk

GroundFighting SOFT CHECK

26.839

29.5% checker faints 8.81%

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 →

Ranked #36 with 5.17% usage. Sorted by reliability score.