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?

Tatsugiri has the strongest conservative score in this observed Feb 2026 - Apr 2026 sample. The target was knocked out or switched out in 66.5% of 25.56921244294019 relevant encounters. Standard error is 9.3 points. Sets and switch conditions can change the result.

How are Rillaboom matchup checks ranked in Gen 9 VGC 2026 Regulation F Best of 3?

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 VGC 2026 Regulation F Best of 3 · Sorted by p − 4 standard errors · Smogon source period Feb 2026 - Apr 2026 · Generated 2026-05-27

#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%

Leading observed checks

Open a matchup for a separate set-based damage estimate, or browse uploaded teams with both Pokémon.

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

Tatsugiri

DragonWater OFFENSIVE CHECK View matchup

25.569

29.1

66.5% Standard error 9.34 points

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 →

Urshifu-Rapid-Strike

FightingWater SOFT CHECK View matchup

156.484

28.6

44.5% Standard error 3.97 points

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 →

Incineroar

FireDark SOFT CHECK View matchup

211.885

25.9

39.3% Standard error 3.36 points

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 →

Landorus

GroundFlying SOFT CHECK View matchup

74.09

24.6

47.8% Standard error 5.80 points

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 →

Urshifu

FightingDark OFFENSIVE CHECK View matchup

27.51

23.8

61.0% Standard error 9.30 points

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 →

Ogerpon-Wellspring

GrassWater SOFT CHECK View matchup

53.277

16.2

43.4% Standard error 6.79 points

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 →

Ogerpon-Hearthflame

GrassFire SOFT CHECK View matchup

35.501

16.1

49.7% Standard error 8.39 points

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 →

Rillaboom

Grass SOFT CHECK View matchup

60.717

16.1

41.3% Standard error 6.32 points

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 →

Amoonguss

GrassPoison SOFT CHECK View matchup

80.41

15.7

37.2% Standard error 5.39 points

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 →

Flutter Mane

GhostFairy SOFT CHECK View matchup

72.87

9.6

31.3% Standard error 5.43 points

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 →

Dragonite

DragonFlying SOFT CHECK View matchup

27.934

8.0

45.8% Standard error 9.43 points

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 →

Farigiraf

NormalPsychic SOFT CHECK View matchup

21.524

6.3

49.4% Standard error 10.78 points

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 →

Ursaluna

GroundNormal SOFT CHECK View matchup

34.086

6.0

39.5% Standard error 8.37 points

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 →

Indeedee-F

PsychicNormal SOFT CHECK View matchup

53.187

5.5

30.8% Standard error 6.33 points

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 →

Raging Bolt

ElectricDragon SOFT CHECK View matchup

35.443

5.2

37.8% Standard error 8.14 points

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 →

Chien-Pao

DarkIce SOFT CHECK View matchup

21.47

5.0

48.1% Standard error 10.78 points

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 →

Regidrago

Dragon SOFT CHECK View matchup

20.696

-0.1

43.5% Standard error 10.90 points

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 →

Tornadus

Flying SOFT CHECK View matchup

24.803

-4.5

33.4% Standard error 9.47 points

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 →

Iron Crown

SteelPsychic SOFT CHECK View matchup

21.381

-5.2

36.4% Standard error 10.40 points

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 →

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