This is a guide to movesets and best builds for using Rillaboom in competitive play for the games Pokemon Scarlet and Violet (SV). Read on for tips on the best Nature, EV spreads, Movesets, Tera Type, and Held Items to use with Rillaboom, as well as its strengths and weaknesses.

Rillaboom - Related Guides
Evolution and Learnset	Moveset for Ranked Battle	Tera Raid Build

Rillaboom Base Stats, Type, Ability and Weakness

Blueberry #229		Type
Rillaboom
		Abilities
		Overgrow Grassy Surge (Hidden)
Weak to:
	(2x)
Damaged Normally By:	(1x)
Resists:	(0.5x)

What is Type Effectiveness?

Base Stats

Best Nature for Rillaboom

What are Natures?

Singles Movesets for Rillaboom

Offensive Moveset & Best Build

Nature	Adamant (+Atk, -Sp. Atk)
EV Spread	Atk 252 / Sp. Def 4 / Spe 252
Final Stat Values	HP 175 / Atk 194 / Def 110 / Sp. Def 91 / Speed 137
Ability	Grassy Surge
Tera Type
Held Item	Choice Band / Assault Vest
Moveset	・ Grassy Glide ・ Knock Off ・ Tera Blast ・ U-turn

Summary

Great Attack stat and good bulk. Strong Ability in Grassy Surge. Ability has synergy with the powerful Grassy Glide.

Ability and Held Item

Ability	Held Item
Grassy Surge	Choice Band Assault Vest

Grassy Surge is Rillaboom's best Ability to set Grassy Terrain to protect teammates from moves like Earthquake and to give passive recovery to every Pokemon on the field. Grassy Terrain is also necessary for Grassy Glide to have a +1 priority.

Rillaboom can use either a Choice Band or an Assault Vest for this build. Choice Band is the offensive option since it increases Rillaboom's damage output, while Assault Vest is the defensive option since it allows Rillaboom to tank hits from opposing Special Attackers.

Moves Breakdown

Grassy Glide is Rillaboom's best Grass-type STAB attack since it has a +1 priority while Grassy Terrain is active.

Knock Off is a strong offensive utility option that allows Rillaboom to remove the opponent's held item.

Tera Blast is Rillaboom's preferred coverage move because, once Terastallized to Rock, it will check all of Rillaboom's counters except for Poison.

U-Turn is used to pivot Rillaboom out of bad matchups.

Best Tera Type: Rock

Rock Tera Type Matchup
Weak to:
	(2x)
Damaged Normally By:	(1x)
Resists:	(0.5x)

Rock is the best Tera Type for this build because it turns Rillaboom's common Flying and Fire weaknesses into resists. It also makes Tera Blast a fantastic coverage move once Rillaboom Terastallizes.

Best Rock Type Pokemon

EV Spread and Nature

A full 252 EVs are put into its Attack and Speed to make Rillaboom hit as hard and fast as possible. The extra 4 EVs are placed into Sp. Def to help round out its bulk, especially if it's holding an Assault Vest.

An Adamant nature is preferred to maximize Rillaboom's damage output.

Other Viable Moves

Key Damage Calculations

Damage Dealt by Rillaboom
80 HP | 84 Def Defensive EV Investment: 4 Def Item: Hearthflame Mask	Tera Type: Tera Blast 168-200 (108.3 - 129%) Guaranteed OHKO Regardless of Item
55 HP｜55 Def No Defensive EV Investment Item: Booster Energy	Item: Choice Band Grassy Glide 157-186 (120.7 - 143%) Guaranteed OHKO Item: Assault Vest Grassy Glide 131 ~ 161 (104.6 ~ 123.8%) Guaranteed 2HKO after Grassy Terrain recovery
113 HP｜120 Def Defensive EV Investment: 252 HP Item: Assault Vest	Item: Choice Band Grassy Glide 168-200 (76.3 - 90.9%) Guaranteed 2HKO Item: Assault Vest Grassy Glide 114-134 (51.8 - 60.9%) 93.8% Chance to 2HKO after Grassy Terrain recovery
100 HP｜100 Def Defensive EV Investment: 4 HP Item: Mystic Water	Item: Choice Band Grassy Glide 198-234 (113.1 - 133.7%) Guaranteed OHKO Item: Assault Vest Grassy Glide 132-156 (75.4 - 89.1%) Guaranteed 2HKO after Grassy Terrain recovery
Damage Received by Rillaboom
135 Sp. Atk Offensive EV Investment: 252 Sp. Atk Item: Assault Vest	Rillaboom: Choice Band Blood Moon 178-210 (101.7 - 120%) Guaranteed OHKO Rillaboom: Assault Vest Blood Moon 118-141 (67.4 - 80.5%) Guaranteed 2HKO after Grassy Terrain recovery

Game8's Competitive Damage Calculator

Grassy Seed Moveset & Best Build

Nature	Adamant (+Atk, -Sp. Atk)
EV Spread	Atk 252 / Def 4 / Spe 252
Final Stat Values	HP 175 / Atk 194 / Def 111 / Sp. Def 90 / Speed 137
Ability	Grassy Surge
Tera Type
Held Item	Grassy Seed
Moveset	・ Grassy Glide ・ Knock Off ・ Taunt ・ U-turn

Summary

Incredibly versatile moveset. Strong Ability in Grassy Surge. Ability has synergy with the powerful Grassy Glide.

Ability and Held Item

Ability	Held Item
Grassy Surge	Grassy Seed

Grassy Surge is Rillaboom's best Ability to set Grassy Terrain to protect teammates from moves like Earthquake and to give passive recovery to every Pokemon on the field. Grassy Terrain is also necessary for Grassy Glide to have a +1 priority.

Grassy Seed is used to boost Rillaboom's Defense stat by one stage the first time it switches in.

Moves Breakdown

Grassy Glide is Rillaboom's best Grass-type STAB attack since it has a +1 priority while Grassy Terrain is active.

Knock Off is a strong offensive utility option that allows Rillaboom to remove the opponent's held item.

Taunt is used to prevent opposing setup sweepers or hazard setters from using their status moves.

U-Turn is used to pivot Rillaboom out of bad matchups.

Best Tera Type: Rock

Rock Tera Type Matchup
Weak to:
	(2x)
Damaged Normally By:	(1x)
Resists:	(0.5x)

Rock is the best Tera Type for this build because it turns Rillaboom's common Flying and Fire weaknesses into resists.

Best Rock Type Pokemon

EV Spread and Nature

A full 252 EVs are put into its Attack and Speed to make Rillaboom hit as hard and fast as possible. The extra 4 EVs are placed into Def to help round out its bulk especially with the Defense boost from Grassy Seed.

An Adamant nature is preferred to maximize Rillaboom's damage output.

Other Viable Moves

Doubles Movesets for Rillaboom

Grassy Surge Support Moveset & Best Build

Nature	Adamant (+Atk, -Sp. Atk)
EV Spread	140 HP / 252 Atk / 4 Def / 84 Sp. Def / 28 Spe
Final Stat Values	193 HP / 194 Atk / 111 Def / 101 Sp. Def / 109 Spe
Ability	Grassy Surge
Tera Type
Held Item	Life Orb
Moveset	・ Grassy Glide ・ Knock Off ・ Fake Out ・ High Horsepower

Summary

Great Attack stat and good bulk. Strong Ability in Grassy Surge. Ability has synergy with the powerful Grassy Glide. Good offensive utility options in Fake Out and Knock Off.

Ability and Held Item

Ability	Held Item
Grassy Surge	Life Orb

Grassy Surge is Rillaboom's best Ability, which is important for overwriting opposing Terrain, and protecting teammates from Moves like Earthquake. It can also give passive recovery to every Pokemon on the field.

Life Orb is chosen for this build, as it can ensure that it can get decisive KOs on Flutter Mane and Rapid-Strike Urshifu.

Moves Breakdown

Grassy Glide is Rillaboom's most notorious move. It gets a damage nerf this generation but is still useful for antagonizing Grass-weak Pokemon because it retains its Priority in Grassy Terrain. This move single-handedly makes Rillaboom a legitimate check to Iron Bundle, who would threaten it with Freeze-Dry in previous Regulation Formats.

Knock Off can disrupt an opponent and remove valuable items, limiting the effectiveness of opposing Pokemon.

Fake Out is an important move for this set, that forces an opponent to play defensively or lose a turn to flinch.

High Horsepower is a strong Ground-type attack that is useful for damaging Fire-type Pokemon who may want to take on Rillaboom 1-on-1. This move can 2-Hit KO even the bulky Incineroar, making it so Rillaboom isn't solely checked by it.

Best Tera Type: Fire

Fire Tera Type Matchup
Weak to:
	(2x)
Damaged Normally By:	(1x)
Resists:	(0.5x)

Fire is the best Tera Type for this build as it can give Rillaboom resistances to Ice, Bug, and Fire, and more importantly, an immunity to Will-O-Wisp. This also allows Rillaboom to take neutral damage from Poison and Flying-type attacks.

An alternate Grass Tera would be a strong offensive Tera that can help Rillaboom score consistent KOs on the likes of Flutter Mane, however Grass Tera Rillaboom would necessitate an Adamant Nature for maximum consistency.

Best Fire Type Pokemon for Ranked Battle

EV Spread and Nature

Rillaboom is given 140 HP, 4 Defense, and 84 Special Defense EVs to give it sizeable bulk, while a full 252 is put into Attack to maximize its damage potential.

28 Speed EVs are invested so that Rillaboom can outspeed Urshifu Rapid-Strike Style under Tailwind conditions, as well as non-Booster Energy Iron Bundle.

Other Viable Moves

Key Damage Calculations

Damage Dealt by Rillaboom
100 HP｜100 Def Defensive EV Investment: 4 HP Item: Mystic Water	Grassy Glide 174 ~ 205 (98.8 ~ 116.4%) 87.5% Chance toOH KO
55 HP｜55 Def No Defensive EV Investment Item: Booster Energy	Grassy Glide 131 ~ 161 (104.6 ~ 123.8%) Guaranteed OHKO
Damage Received by Rillaboom
Offensive EV Investment: 252 Sp. Atk Item: Mental Herb	Bleakwind Storm 140 ~ 168 (67.6 ~ 81.1%) Guaranteed 2-Hit KO After Grassy Terrain Recovery
Offensive EV Investment: 252 Sp. Atk Item: Life Orb	Heat Wave 198 ~ 234 (95.6 ~ 113%) 68.8% Chance to OHKO

Game8's Competitive Damage Calculator

How to Use Rillaboom Effectively

Use Fake Out to Support Your Team

Fake Out is Rillaboom's most important move and is largely why it is still strong despite not having access to Grassy Glide. Use this to get better positioning in a match!

Use Rillaboom to KO Flutter Mane and Rapid-Strike Ushifu

Rillaboom with Grassy Glide can effectively work as a check to Flutter Mane and Urshifu, out-prioritizing both, and KOing them if they have not invested heavily in physical bulk.

How to Build a Team with Rillaboom

Rillaboom can comfortably fill a slot in your team if you need a Grass-type. It is a solid addition to any Fire-Water-Grass core and fulfils a supportive or offensive role.

Sample Singles Team

Offensive Lead	Physical Attacker	Special Attacker
Rillaboom	Ogerpon (Hearthflame Mask)	Iron Bundle

Rillaboom is a great lead to set up an early Grassy Terrain and threaten quick knockouts with Grassy Glide. It can also cripple opposing leads with moves like Knock Off and Taunt. If Rillaboom is lead versus a bad matchup, then it can also switch out with U-Turn.

Hearthflame Ogerpon is used as a mind game tool to trick your opponents into thinking that it also has Grassy Glide. If they think that they will get knocked out by Ogerpon's Grassy Glide, they will defensively Terastallize and you can hit them with an Ivy Cudgel instead.

Iron Bundle has good matchups into Pokemon that the rest of the team cannot deal with. Between STAB Hydro Pump and Freeze-Dry, it is difficult for most Pokemon to wall Iron Bundle even with a defensive Tera.

Sample Doubles Team

Physical Attacker / Sun Setter	Support / Special Attacker
Groudon	Venusaur
Support / Physical Attacker	Support / Physical Attacker
Incineroar	Rillaboom

Venusaur can be an effective partner to Groudon in Regulation G, as it has in the past, offering disruptive support with Sleep Powder, as well as being able to threaten Water-types that Groudon may have trouble with.

Rillaboom can protect Groudon from Water-types as well with its Priority Grassy Glide.

Incineroar can offer consistent support in a team with Sun, as it can Intimidate and pivot out with U-Turn or Parting Shot, as well as enjoy Sun-boosted Flare Blitz.

Counters for Rillaboom

Hit Rillaboom with Super-Effective Attacks

While modestly bulky, Rillabooms usually do not carry Protect and will be susceptible to getting double-targeted. Have it waste Fake Out with a well-timed Tera or Protect, and take it out of the game as soon as possible!

Best Pokemon to Use

Pokemon	Description
Tornadus (Incarnate Forme)	Ranking: ★★★★★ ・Can Tera to protect itself from Fake Out. ・Can hit Rillaboom for super-effective damage with Bleakwind Storm. ▶️Tornadus Best Movesets
Galarian Moltres	Ranking: ★★★★ ・Can wall all of Rillaboom's offensive options. ・Can hit Rillaboom with a super-effective Flying-type attack. ▶️Galarian Moltres Best Movesets
Landorus (Therian Forme)	Ranking: ★★★★ ・Can wall all of Rillaboom's offensive options. ・Can hit Rillaboom with a super-effective Flying-type attack. ▶️Landorus Best Movesets

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