Is Rillaboom viable in Gen 9 OU?

Rillaboom is ranked #41 in Gen 9 OU with 4.82% usage according to Smogon Mar 2026 - May 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 Mar 2026 - May 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 · Mar 2026 - May 2026

#0812 Rillaboom

Grass

USAGE 4.8% #41

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 99.5% Knock Off 93.9% Wood Hammer 63.7% Swords Dance 48.7% U-turn 48.3% High Horsepower 29.0% Tera Blast 5.5% Low Kick 5.1%

Items

Life Orb 31.1% Choice Band 22.3% Terrain Extender 9.2% Miracle Seed 7.8% Heavy-Duty Boots 7.4% Assault Vest 7.3% Lum Berry 7.1% Choice Scarf 5.2%

Abilities

Grassy Surge99.9%Overgrow0.1%

Tera Types

Grass 58.8% Dark 25.5% Fire 7.1% Electric 2.9% Fairy 2.7% Fighting 0.7% Ground 0.6% Poison 0.5%

Common Teammates

Gholdengo39.1%

Zamazenta36.4%

Great Tusk28.9%

Landorus-Therian24.2%

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

Ranked by reliability — blends KO rate with how often each Pokémon is matched up.

# Checker Encounters Reliability KO Rate

Dragonite

DragonFlying OFFENSIVE CHECK

33.868

74.3% dies 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% dies 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% dies 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% dies 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 #41 with 4.82% usage. Sorted by reliability score.