Rillaboom - Moveset & Best Build for Ranked Battle | Grassy Surge Hidden Ability Moveset | Pokemon Sword and Shield

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This is a strategy guide for using Rillaboom in competitive play for the games Pokemon Sword and Shield. Read on for tips on the best Nature, EV spreads, Movesets, Builds, and Held Items to use with Rillaboom, as well as its strengths and weak points.

Rillaboom - Related Articles
Pokeball Icon.pngEvolution and Learnset VS Battle Icon.pngBuild for Ranked Battle Gigantamax RillaboomGigantamax Rillaboom

Basic Information for Rillaboom

Types and Abilities

Pokemon Type 1 Type 2
Grass Type
Overgrow Powers up Grass-type moves in a pinch.
Grassy Surge (Hidden) The Pokemon creates a Grassy Terrain when it enters a battle.

Type Defenses

Takes 4x damage
Takes 2x damage
Pokemon Fire Image Pokemon Ice Image Pokemon Poison Image Pokemon Flying Image Pokemon Bug Image
Takes 0.5x damage
Pokemon Water Image Pokemon Grass Image Pokemon Electric Image Pokemon Ground Image
Takes 1/4x damage
Takes 0x damage

What is Type Effectiveness?

Base Stats

HP Attack Defense Sp. Atk Sp. Def Speed
100 125 90 60 70 85

Best Nature for Rillaboom

Best Natures
(+Spd, -SpAtk)
Adamant[nl(+Atk, -SpAtk)

What are Natures?

How to Learn Rillaboom's Egg Moves

Hammer Arm Inherit from Rhydon (Learnable on evolution) or Stufful(learns at Lv. 32)

Moveset & Best Build for Rillaboom

Choice Item Moveset & Best Build

Choice Item Rillaboom.png

Nature Jolly (+Spd, -SpAtk)
EV Spread Atk. 252 / Spd. 252 / HP 4
Final Stat Values HP 176 / Atk. 177 / Def. 110 / Sp.Def. 90 / Spd. 150
Ability Grassy Surge
Held Item Choice Scarf / Choice Band
Moveset U-turn
Drum Beating
Knock Off
Grassy Glide

This set focuses on taking advantage of Rillaboom's high Defense and Speed, while escaping from difficult matchups with U-turn. Even if the opponents outspeeds Rillaboom, it can use Drum Beating to decrease its opponent's Speed and gain the upper hand.

With its Hidden Ability Grassy Surge, Rillaboom will automatically set up Grassy Terrain to power up all Grass-type moves to 1.3x power. This allows it to take out Wash Rotom with 252 EVs placed in HP with a single Drum Beating, and handle a variety of opponents that it could not have before with its newfound power boost.

Grassy Surge also ensures Rillaboom's Grassy Glide has increased priorty, allowing it to hit faster Water, Rock, and Ground-type Pokemon for super effective damage.

How to Get Grassy Surge Rillaboom

A free Grookey with the Grassy Surge Ability is available via Pokemon HOME. Learn how to get all three Galar Starters with Hidden Abilities and transfer them to Pokemon Sword and Shield with our guide below:
How to Get & Transfer Hidden Ability Starters from Pokemon HOME

Other Viable Moves

Wood Hammer An alternate choice for Drum Beating for when you want to prioritize damage above all else.
High Horsepower An alternate Ground move for when you want to Dynamax Rillaboom. Its power doesn't decrease with Grassy Terrain, making it more effective than Earthquake in this context.

Assault Vest Moveset & Best Build

Assault Vest Rillaboom.png

Nature Adamant (+Atk, -SpAtk)
EV Spread Atk. 252 / HP 140 / Sp.Def. 84 / Spd. 28 / Def. 4
Final Stat Values HP 190 / Atk. 194 / Def. 111 / Sp.Def. 101 / Spd. 109
Ability Grassy Surge
Held Item Assault Vest
Moveset Drum Beating
Grassy Glide
Knock Off

This build is a better for handling opponents like Primarina, Excadrill and Wash Rotom. These Pokemon rarely have an attack which can hit Rillaboom effectively, so use Drum Beating on whatever switches and Grassy Glide on Pokemon that can outspeed you.

Its EVs are placed here to allow it to outspeed a Mimikyu with its Speed decreased by one stage, so it can take the upper hand when Mimikyu comes out on a switch-in. When Mimikyu hasn't used Swords Dance yet, Rillaboom can handle its hits with no problem, and it can beat back to net a KO.

Other Viable Moves

High Horsepower An alternate Ground move for when you want to Dynamax Rillaboom. Its power doesn't decrease with Grassy Terrain, making it more effective than Earthquake in this context.
Hammer Arm An alternate choice for Knock Off if you need extra coverage. It drops Rillaboom's speed by 1 stage every time you use it, but this can be alleviated by using Grassy Glide.

How to Use Rillaboom Effectively

An attacker who combines Attack and Defense

Rillaboom is able to hit hard with its high Attack. It also has high Speed, so arming it with a Choice Scarf can allow it to take advantage of this to move faster and defeat many opponents.

Must watch out for its many weaknesses

As a Grass-type Pokemon, Rillaboom is cursed with weaknesses to Fire, Flying and others which are frequently held even by non-STAB opponents. Don't send it up against opponents who it can't handle.

Counters for Rillaboom

Take advantage of its weaknesses

As Rillaboom is a Grass-type Pokemon, a type with several weaknesses, and since it can only learn Moves of a few types, it's easy to exploit these weaknesses with an advantageously-typed Pokemon.

Best Pokemon to Use

Pokemon Description
Heat Rotom ImageHeat Rotom Ranking: ★★★★★
・Can go for a knockout with Overheat
・Can handle almost all of Rillaboom's attacks with its type combination and Levitate
Corviknight ImageCorviknight Ranking: ★★★★☆
・A physical attacker with a great dual-typing of Flying and Steel
・Can take an attack even when switched in on Rillaboom
Best Ranked Battle Build for Corviknight
Gyarados ImageGyarados Ranking: ★★★★☆
・Can deal super effective damage while raising its Speed with Max Airstream
Best Ranked Battle Build for Gyarados

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2 Anonymous7 months

>>1 You’re telling me. I’m all in for powerhouses, but rejecting Brick Break is abysmal from my understanding.

1 Anonymous8 months

Hi why do you choose superpower instead of brick break. Cause superpower decreases attack and defense. And brick break allows you to hit through screens Just doesn't make sense.

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