Is Rillaboom viable in Gen 9 Champions VGC 2026 Reg M-C Best of 3?

Rillaboom is ranked #1 in Gen 9 Champions VGC 2026 Reg M-C Best of 3 with 54.10% usage according to Smogon Sep 2026 data.

What beats Rillaboom in Gen 9 Champions VGC 2026 Reg M-C Best of 3?

Sneasler has the strongest conservative score in this observed Sep 2026 sample. The target was knocked out or switched out in 50.1% of 51.01053764679721 relevant encounters. Standard error is 7.0 points. Sets and switch conditions can change the result.

How are Rillaboom matchup checks ranked in Gen 9 Champions VGC 2026 Reg M-C 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 Champions VGC 2026 Reg M-C Best of 3 · Smogon source period Sep 2026

#0812 Rillaboom

Grass

USAGE 54.1% #1

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 99.9% Grassy Glide 99.5% Wood Hammer 86.1% High Horsepower 57.6% U-turn 36.3% Protect 16.2% Superpower 2.0% Drum Beating 1.3%

Items

Miracle Seed 68.5% Eject Button 8.3% Sitrus Berry 8.3% Occa Berry 6.3% Life Orb 5.2% Kebia Berry 1.3% Leftovers 0.7% Focus Sash 0.3%

Abilities

Grassy Surge99.9%Overgrow0.1%

Common Teammates

Browse Gen 9 Champions VGC 2026 Reg M-C Best of 3 teams using Rillaboom →

Explore Rillaboom + Sneasler teams 22 score Explore Rillaboom + Rillaboom teams 12 score Explore Rillaboom + Kingambit teams 9 score Explore Rillaboom + Arcanine-Hisui teams 8 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 + Sneasler 46.2% 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

Sneasler

FightingPoison SOFT CHECK View matchup

51.011

22.1

50.1% Standard error 7.00 points

DAMAGE CALCGrassy Terrain

252+ Atk Sneasler Dire Claw vs. 252 HP / 0 Def Rillaboom: 168-198 (81.1 - 95.6%) -- guaranteed 2HKO after Grassy Terrain recovery

View Sneasler counters → Teams with Sneasler →

Incineroar

FireDark SOFT CHECK View matchup

67.391

16.8

40.7% Standard error 5.99 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 →

Rillaboom

Grass SOFT CHECK View matchup

47.755

12.3

40.7% Standard error 7.11 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 → Teams with Rillaboom →

Gholdengo

SteelGhost SOFT CHECK View matchup

28.409

9.6

47.0% Standard error 9.36 points

DAMAGE CALCGrassy Terrain

252+ SpA Life Orb Gholdengo Make It Rain vs. 252 HP / 252+ SpD Rillaboom: 133-157 (64.2 - 75.8%) -- guaranteed 2HKO after Grassy Terrain recovery

View Gholdengo counters →

Kingambit

DarkSteel SOFT CHECK View matchup

40.597

8.9

39.6% Standard error 7.68 points

DAMAGE CALCGrassy Terrain

252+ Atk Life Orb Kingambit Kowtow Cleave vs. 252 HP / 0 Def Rillaboom: 117-138 (56.5 - 66.6%) -- guaranteed 2HKO after Grassy Terrain recovery

View Kingambit counters → Teams with Kingambit →

Arcanine-Hisui

FireRock SOFT CHECK View matchup

23.166

8.4

50.0% Standard error 10.39 points

DAMAGE CALCGrassy Terrain

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

View Arcanine-Hisui counters → Teams with Arcanine-Hisui →

Indeedee-F

PsychicNormal SOFT CHECK View matchup

34.81

5.2

38.1% Standard error 8.23 points

DAMAGE CALCPsychic Terrain

252+ SpA Indeedee-F Terrain Pulse (100 BP Psychic) vs. 252 HP / 252+ SpD Rillaboom in Psychic Terrain: 88-105 (42.5 - 50.7%) -- 2% chance to 2HKO

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

Salamence-Mega

DragonFlying SOFT CHECK View matchup

22.012

4.7

47.3% Standard error 10.64 points

DAMAGE CALCGrassy Terrain

0- Atk Aerilate Salamence-Mega Double-Edge vs. 252 HP / 0 Def Rillaboom: 218-260 (105.3 - 125.6%) -- guaranteed OHKO

View Salamence-Mega counters →

Charizard-Mega-Y

FireFlying SOFT CHECK View matchup

25.53

3.1

42.1% Standard error 9.77 points

DAMAGE CALCSun

252+ SpA Charizard-Mega-Y Weather Ball (100 BP Fire) vs. 252 HP / 252+ SpD Rillaboom in Sun: 296-350 (142.9 - 169%) -- guaranteed OHKO

View Charizard-Mega-Y counters →

Raichu-Mega-Y

Electric SOFT CHECK View matchup

20.015

-1.9

42.3% Standard error 11.04 points

DAMAGE CALCGrassy Terrain

252+ SpA Raichu-Mega-Y Focus Blast vs. 252 HP / 252+ SpD Rillaboom: 79-93 (38.1 - 44.9%) -- guaranteed 3HKO after Grassy Terrain recovery

View Raichu-Mega-Y counters →

Basculegion

WaterGhost SOFT CHECK View matchup

30.236

-3.6

29.6% Standard error 8.31 points

DAMAGE CALCGrassy Terrain

252+ Atk Basculegion Head Smash vs. 252 HP / 0 Def Rillaboom: 93-110 (44.9 - 53.1%) -- 0.4% chance to 2HKO after Grassy Terrain recovery

View Basculegion counters →

Ranked #1 with 54.10% usage. Sorted by conservative score.