Level 16To Thwackey

Level 35To Rillaboom

RillaboomLast stage shown

#0812 · GENERATION 8

Rillaboom Build Guide

Grass

Physical attacker and terrain support

Build a Rillaboom team ↓

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Custom Pokédex collection.

Starter moveset

Generation 9 · casual singles · base form

ITEMChoice Band

ABILITYGrassy Surge

NATUREAdamant

Wood Hammer

Grassy Glide

Knock Off

U-turn

How to play

Grassy Surge starts Grassy Terrain on entry. Grassy Glide gains priority while Grassy Terrain is active; U-turn can bring in a teammate when a matchup is unfavorable.

Watch out for

Key risk. Choice Band locks you into one move until switching, and Wood Hammer causes recoil. Terrain also helps eligible opponents recover and weakens Earthquake against grounded targets. Priority depends on terrain remaining active.

About this example

This editorial starting point is not a ranked-format recommendation or a legality check. It does not specify EVs or Tera type. Moves, items and abilities here do not change the builder score.

BATTLE PLAN

When to attack, set up or switch

Grassy Surge starts Grassy Terrain on entry. Grassy Glide gains priority while Grassy Terrain is active; U-turn can bring in a teammate when a matchup is unfavorable.

Terrain is ending or has been overwritten

Priority depends on the terrain still being up. Without it Grassy Glide is just another move against a faster target, so check what else sets terrain before you plan a sweep.

You want a different move

Only switching resets the Choice lock. Wood Hammer keeps charging recoil on every hit while locked, so the safest time to switch moves is before you commit to the one you are locking.

A Fire, Ice, Poison, Flying or Bug type switches in

Each of those hits Rillaboom for 2× and Grass types resist nothing here, so U-turn is the move that keeps the team intact instead of trading into the weakness.

What does a safe pivot mean?

A teammate uses a switching move to bring Rillaboom in. A slower pivot may take the opponent’s hit first. Turn order and the opponent’s move still matter.

ITEM & ABILITY

How this build works

Grassy Glide only gains priority while Grassy Terrain is active, and the same terrain heals grounded Pokémon on both sides while weakening Earthquake against grounded targets. Choice Band locks Rillaboom into one move until it leaves the field.

Watch the tradeoff. Choice Band locks you into one move until switching, and Wood Hammer causes recoil. Terrain also helps eligible opponents recover and weakens Earthquake against grounded targets. Priority depends on terrain remaining active.

These battle mechanics do not change the builder’s type-and-base-stat score. The tool does not simulate moves, abilities, held items or damage.

COMPARE YOUR OPTIONS

Rillaboom or Meowscarada?

Meowscarada offers greater Speed and Dark typing without starting Grassy Terrain.

Base stats · standard forms in the local Generation 9 dataset
Stat	Rillaboom	Meowscarada
HP	100	76
Attack	125	110
Defense	90	70
Sp. Attack	60	81
Sp. Defense	70	70
Speed	85	123

Base stats are not final battle stats. Level, nature, IVs, EVs and battle effects affect the result. Check availability in your game before choosing an alternative.

Teammate ideas

A Fire or Steel teammate covers several Grass weaknesses. Consider how Grassy Terrain affects your own Ground attacks.

Incineroar

Resists Fire and Ice and provides another pivoting option.

Read Incineroar guide →Compare teammates →

Corviknight

Resists Flying, Poison and Bug and can pivot with U-turn.

Read Corviknight guide →Compare teammates →

These are typing-based starting pairs, not a complete competitive team. Check the remaining four slots and your game’s rules.

Compare computed teammate suggestions →

Alternative: Meowscarada

Meowscarada offers greater Speed and Dark typing without starting Grassy Terrain.

Read Meowscarada guide →

Try Meowscarada →

Type matchups

Weak to

Fire2×Ice2×Poison2×Flying2×Bug2×

Resistances and immunities

Water0.5×Electric0.5×Grass0.5×Ground0.5×

Typing only. Abilities, items and battle effects can change these matchups.

HP100

Attack125

Defense90

Sp. Attack60

Sp. Defense70

Speed85

Evolution chain

Grookey#810
Level 16
Thwackey#811
Level 35
Rillaboom#812

Standard main-series evolution conditions. Regional forms and games with special evolution systems can differ.

Build your Rillaboom team

Start with Rillaboom. Add teammates and compare your type-and-base-stat score.

Gen 9 · National Dex · Casual Settings & scope

GameFormat

Format scope · casual planning

Base species #001–1025, using Generation 9 data. A casual planning pool, not a VGC, ranked, or Showdown National Dex legality validator. Regional, Mega and alternate forms are not included yet.

SLOT 01#812

Rillaboom

Grass

SLOT 02

SLOT 03

SLOT 04

SLOT 05

SLOT 06

Understand your team

Offense71

Defense57

Coverage17

Synergy8

Types & base stats only · Not a win probability.

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Key insights

Bug attacks threaten 1 of 1 teammates, with no teammate resisting them by type.
Fire attacks threaten 1 of 1 teammates, with no teammate resisting them by type.
Your own types can hit 3 of 18 single-type targets super effectively. Actual move coverage can differ.
No teammate has a base Speed of 100 or higher. Consider adding a faster option.

Detailed type analysis · all 18 types

Incoming damage assumes typing only. 0× = immune, ½× / ¼× = resistant, 2× / 4× = weak. Resistance counts include immunities.

Incoming damage by attacking type
Attack	Rillaboom	Weak	Resist
Normal	1×	0	0
Fire	2×	1	0
Water	½×	0	1
Electric	½×	0	1
Grass	½×	0	1
Ice	2×	1	0
Fighting	1×	0	0
Poison	2×	1	0
Ground	½×	0	1
Flying	2×	1	0
Psychic	1×	0	0
Bug	2×	1	0
Rock	1×	0	0
Ghost	1×	0	0
Dragon	1×	0	0
Dark	1×	0	0
Steel	1×	0	0
Fairy	1×	0	0

Offensive type coverage

Against single-type targets, using only same-type attacks. This is not coverage against every dual-type species.

NormalNeutral

FireResisted

Water✓ Super effective

ElectricNeutral

GrassResisted

IceNeutral

FightingNeutral

PoisonResisted

Ground✓ Super effective

FlyingResisted

PsychicNeutral

BugResisted

Rock✓ Super effective

GhostNeutral

DragonResisted

DarkNeutral

SteelResisted

FairyNeutral

How is the score calculated?

Offense (25%): neutral-or-better type coverage and strongest attacking base stats. Defense (30%): team resistances, unprotected and repeated weaknesses, and 4× vulnerabilities. Coverage (25%): fraction of 18 single-type targets hit super effectively by your own types. Synergy (20%): teammates resisting each other’s weaknesses, physical/special/bulk stat signals and base Speed ≥100. Scores are rounded to 0–100; the total uses the displayed subscores.

Rating bands: Excellent ≥80, Good ≥65, Fair ≥45, Poor below 45. An empty team has no rating.

Small teams are provisional and are not given a separate completion bonus. Adding a Pokémon can lower the score if it creates new weaknesses or lowers averages. These initial heuristics have not been calibrated against battle outcomes.