
Type: Grass
Base Stats: 100 HP / 125 Attack / 90 Defense / 60 Special Attack / 70 Special Defense / 85 Speed
Abilities: Overgrow / Grassy Surge (HA)
Notable Moves:
- Knock Off
- Wood Hammer
- Drain Punch
- U-turn
- Bulk Up
- Swords Dance
- Earthquake
- Acrobatics
Pros:
- Great Attack stat with decent HP and Defense stats allow it to function as a strong wallbreaker.
- Decent attacking options, with a solid Grass STAB + coverage options like Earthquake, Drain Punch, and Knock Off
- Has access to longevity thanks to its access to Drain Punch
- Can function as a strong pivot thanks to its access to U-turn
- Can provide a form of healing to its teammates thanks to its access to Grassy Surge setting up Grassy Terrain
Cons:
- Losing access to Grassy Glide means it no longer has a way to check faster attackers
- 85 Speed, while being decent, is quite slow in the current metagame, hence it gets outsped by a majority of threats
Tera Potential:
- Tera Dark boosts the power of Knock Off, guaranteeing an OHKO against Skeledirge and a 2HKO on Tera Ghost Garganacl.
- Tera Fighting boosts the power of Drain Punch, guaranteeing an OHKO on Baxcalibur
- Tera Fairy allows Rillaboom to offensively threaten faster Pokemon like Iron Valiant, Dragapult, and Roaring Moon. Defensively, it grants a resistance to Bug and Fighting and an immunity to Dragon.
- Tera Flying turns its resistance to Fighting into an immunity, and it can now threaten Amoonguss, Breloom, and Volcarona.
Potential Sets:
Choice Scarf
Rillaboom @ Choice Scarf
Ability: Grassy Surge
EVs: 252 Atk / 4 SpD / 252 Spe
Tera Type: Dark / Fighting / Fairy / Flying
Jolly Nature
- Wood Hammer
- Knock Off
- Drain Punch / Tera Blast
- U-turn
In order to compensate for losing Grassy Glide, Rillaboom can still threaten would-be faster Pokemon like Dragapult and Roaring Moon with Choice Scarf. Choice Scarf in tandem with a Jolly nature allows Rillaboom to outspeed the aforementioned Dragapult and Roaring Moon as well as Choice Scarf Gholdengo. Knock Off allows Rillaboom to remove HDB from Pokemon like Skeledirge and Volcarona. Drain Punch grants Rillaboom access to recovery and can OHKO Chien-Pao. When running Tera Fairy or Tera Flying, Tera Blast is the better option. U-turn allows Rillaboom to function as a fast pivot.
Choice Band
Rillaboom @ Choice Band
Ability: Grassy Surge
EVs: 252 Atk / 4 SpD / 252 Spe
Tera Type: Dark / Fighting / Fairy / Flying
Jolly Nature
- Wood Hammer
- Knock Off
- Drain Punch / Tera Blast
- U-turn
Equipped with a Choice Band, Rillaboom becomes a really strong wallbreaker that few can switch in safely. Its strong Wood Hammer shreds Garganacl, Ting-Lu, and Dondozo. It's basically the same set from SS adapted based on its new movepool.


Rillaboom, despite all of its points for, can struggle to find a place in this new fast-paced metagame. Losing Grassy Glide, one of the moves that made it threatening in Sword and Shield, can prove to be a pain for it. Losing Grassy Glide also loses one of the most important reasons for running Grassy Surge over Overgrown. Not only that, but it also faces very strong competition from Pokemon that have the same role as it but better. Meowscarada is a better Grass-type thanks to a better offensive ability in Protean and higher Speed. Kingambit has a similar role to Rillaboom, yet has a better offensive ability in Supreme Overlord and access to a strong priority move in Sucker Punch.
Prediction: Rillaboom at best drops to UU at some point