Is Rillaboom viable in Gen 9 VGC 2026 Regulation F Best of 3?

Rillaboom is ranked #8 in Gen 9 VGC 2026 Regulation F Best of 3 with 23.69% usage according to Smogon Feb 2026 - Apr 2026 data.

What beats Rillaboom in Gen 9 VGC 2026 Regulation F Best of 3?

The best counter for Rillaboom in Gen 9 VGC 2026 Regulation F Best of 3 is Tatsugiri with a 66.5% win rate when they meet. Based on Smogon's Feb 2026 - Apr 2026 usage data, the top Pokémon that beat Rillaboom include Tatsugiri, Urshifu, Ogerpon-Hearthflame, Farigiraf, Chien-Pao.

What is the best counter for Rillaboom in Gen 9 VGC 2026 Regulation F Best of 3?

Tatsugiri is the best counter for Rillaboom in Gen 9 VGC 2026 Regulation F Best of 3, KOing or forcing it out in 66.5% of their encounters.

Rillaboom counters

Gen 9 VGC 2026 Regulation F Best of 3 · Sorted by reliability score · Smogon · Feb 2026 - Apr 2026

#0812 Rillaboom

Grass

USAGE 23.7% #8

ABILITYGrassy Surge

BASE STATS

HP 100

ATK 125

DEF 90

SPA 60

SPD 70

SPE 85

BST530

TYPE MATCHUPS

2×

FireIcePoisonFlyingBug

½×

WaterElectricGrassGround

Moves

Fake Out 100.0% Grassy Glide 99.9% Wood Hammer 98.3% U-turn 52.9% High Horsepower 45.8% Drum Beating 2.0% Taunt 0.7% Protect 0.1%

Items

Assault Vest 88.4% Clear Amulet 5.6% Meadow Plate 3.9% Miracle Seed 1.8% Loaded Dice 0.1% Rocky Helmet 0.1% Life Orb 0.1% Sitrus Berry 0.0%

Abilities

Grassy Surge100.0%Overgrow0.0%

Tera Types

Fire 82.9% Water 11.9% Grass 3.4% Ground 0.8% Poison 0.6% Steel 0.3% Ghost 0.2% Rock 0.0%

Common Teammates

Urshifu-Rapid-Strike79.7%

Raging Bolt76.1%

Incineroar71.4%

Landorus49.7%

Ogerpon-Hearthflame43.9%

Flutter Mane43.4%

Chien-Pao43.2%

Kingambit14.8%

Checks & Counters

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

# Checker Encounters Reliability KO Rate

Tatsugiri

DragonWater OFFENSIVE CHECK

25.569

66.5% dies 9.34%

DAMAGE CALCGrassy Terrain

252+ SpA Tatsugiri Draco Meteor vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 69-82 (33.3 - 39.6%) -- 25.2% chance to 3HKO after Grassy Terrain recovery

View Tatsugiri counters → Teams with Tatsugiri →

Urshifu

FightingDark OFFENSIVE CHECK

27.51

61.0% dies 9.30%

DAMAGE CALCGrassy Terrain

252+ Atk Choice Band Urshifu Close Combat vs. 252 HP / 0 Def Rillaboom: 186-219 (89.8 - 105.7%) -- 37.5% chance to OHKO

View Urshifu counters → Teams with Urshifu →

Ogerpon-Hearthflame

GrassFire SOFT CHECK

35.501

49.7% dies 8.39%

DAMAGE CALCGrassy Terrain

252+ Atk Hearthflame Mask Ogerpon-Hearthflame Ivy Cudgel vs. 252 HP / 0 Def Rillaboom: 234-276 (113 - 133.3%) -- guaranteed OHKO

View Ogerpon-Hearthflame counters → Teams with Ogerpon-Hearthflame →

Farigiraf

NormalPsychic SOFT CHECK

21.524

49.4% dies 10.78%

DAMAGE CALCGrassy Terrain

252+ SpA Farigiraf Psyshock vs. 252 HP / 0 Def Rillaboom: 73-87 (35.2 - 42%) -- 85.5% chance to 3HKO after Grassy Terrain recovery

View Farigiraf counters → Teams with Farigiraf →

Chien-Pao

DarkIce SOFT CHECK

21.47

48.1% dies 10.78%

DAMAGE CALCGrassy Terrain

252+ Atk Sword of Ruin Chien-Pao Icicle Crash vs. 252 HP / 0 Def Rillaboom: 222-264 (107.2 - 127.5%) -- guaranteed OHKO

View Chien-Pao counters → Teams with Chien-Pao →

Landorus

GroundFlying SOFT CHECK

74.09

47.8% dies 5.80%

DAMAGE CALCGrassy Terrain

252+ SpA Life Orb Sheer Force Landorus Sludge Bomb vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 104-125 (50.2 - 60.3%) -- 87.1% chance to 2HKO after Grassy Terrain recovery

View Landorus counters → Teams with Landorus →

Dragonite

DragonFlying SOFT CHECK

27.934

45.8% dies 9.43%

DAMAGE CALCGrassy Terrain

252+ Atk Choice Band Dragonite Aerial Ace vs. 252 HP / 0 Def Rillaboom: 188-224 (90.8 - 108.2%) -- 43.8% chance to OHKO

View Dragonite counters → Teams with Dragonite →

Urshifu-Rapid-Strike

FightingWater SOFT CHECK

156.484

44.5% dies 3.97%

DAMAGE CALCGrassy Terrain

252+ Atk Urshifu-Rapid-Strike Close Combat vs. 252 HP / 0 Def Rillaboom: 124-147 (59.9 - 71%) -- guaranteed 2HKO after Grassy Terrain recovery

View Urshifu-Rapid-Strike counters → Teams with Urshifu-Rapid-Strike →

Regidrago

Dragon SOFT CHECK

20.696

43.5% dies 10.90%

DAMAGE CALCGrassy Terrain

252+ SpA Life Orb Dragon's Maw Regidrago Dragon Energy (150 BP) vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 138-164 (66.6 - 79.2%) -- guaranteed 2HKO after Grassy Terrain recovery

View Regidrago counters → Teams with Regidrago →

Ogerpon-Wellspring

GrassWater SOFT CHECK

53.277

43.4% dies 6.79%

DAMAGE CALCGrassy Terrain

252+ Atk Wellspring Mask Ogerpon-Wellspring Wood Hammer vs. 252 HP / 0 Def Rillaboom in Grassy Terrain: 90-107 (43.4 - 51.6%) -- guaranteed 3HKO after Grassy Terrain recovery

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

Rillaboom

Grass SOFT CHECK

60.717

41.3% dies 6.32%

DAMAGE CALCGrassy Terrain

252+ Atk Rillaboom U-turn vs. 252 HP / 0 Def Rillaboom: 94-112 (45.4 - 54.1%) -- 3.1% chance to 2HKO after Grassy Terrain recovery

View Rillaboom counters → Teams with Rillaboom →

Ursaluna

GroundNormal SOFT CHECK

34.086

39.5% dies 8.37%

DAMAGE CALCGrassy Terrain

252+ Atk Ursaluna Facade vs. 252 HP / 0 Def Rillaboom: 76-91 (36.7 - 43.9%) -- 99.9% chance to 3HKO after Grassy Terrain recovery

View Ursaluna counters → Teams with Ursaluna →

Incineroar

FireDark SOFT CHECK

211.885

39.3% dies 3.36%

DAMAGE CALCGrassy Terrain

252+ Atk Incineroar Flare Blitz vs. 252 HP / 0 Def Rillaboom: 224-266 (108.2 - 128.5%) -- guaranteed OHKO

View Incineroar counters → Teams with Incineroar →

Raging Bolt

ElectricDragon SOFT CHECK

35.443

37.8% dies 8.14%

DAMAGE CALCGrassy Terrain

252+ SpA Raging Bolt Draco Meteor vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 76-90 (36.7 - 43.4%) -- 99.2% chance to 3HKO after Grassy Terrain recovery

View Raging Bolt counters → Teams with Raging Bolt →

Amoonguss

GrassPoison SOFT CHECK

80.41

37.2% dies 5.39%

DAMAGE CALCGrassy Terrain

252+ SpA Amoonguss Sludge Bomb vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 78-92 (37.6 - 44.4%) -- guaranteed 3HKO after Grassy Terrain recovery

View Amoonguss counters → Teams with Amoonguss →

Iron Crown

SteelPsychic SOFT CHECK

21.381

36.4% dies 10.40%

DAMAGE CALCGrassy Terrain

252+ SpA Iron Crown Tachyon Cutter (2 hits) vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 54-66 (26 - 31.8%) -- 10.1% chance to 4HKO after Grassy Terrain recovery

View Iron Crown counters → Teams with Iron Crown →

Tornadus

Flying SOFT CHECK

24.803

33.4% dies 9.47%

DAMAGE CALCGrassy Terrain

252+ SpA Tornadus Bleakwind Storm vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 110-132 (53.1 - 63.7%) -- guaranteed 2HKO after Grassy Terrain recovery

View Tornadus counters → Teams with Tornadus →

Flutter Mane

GhostFairy SOFT CHECK

72.87

31.3% dies 5.43%

DAMAGE CALCGrassy Terrain

252+ SpA Flutter Mane Moonblast vs. 252 HP / 252+ SpD Assault Vest Rillaboom: 55-66 (26.5 - 31.8%) -- 37.5% chance to 4HKO after Grassy Terrain recovery

View Flutter Mane counters → Teams with Flutter Mane →

Indeedee-F

PsychicNormal SOFT CHECK

53.187

30.8% dies 6.33%

DAMAGE CALCPsychic Terrain

252+ SpA Indeedee-F Psychic vs. 252 HP / 252+ SpD Assault Vest Rillaboom in Psychic Terrain: 54-64 (26 - 30.9%) -- guaranteed 4HKO

View Indeedee-F counters → Teams with Indeedee-F →

Ranked #8 with 23.69% usage. Sorted by reliability score.