The Maximizers: Rillaboom, Obstagoon, Toxtricity

The Maximizers is a punk rock band of the Galar region composed of Rillaboom on drums, Obstagoon as the lead vocals, Toxtricity (Amped) on electric guitar, and Toxtricity (Low Key) on bass. If your memory was sharp, they are the group who performed after you defeated Leon in the Championship Match. If you watched the credits of the game roll, you most likely have witnessed their performance.

POKEFELLA BUILD

Rillaboom (F) @ Assault Vest
Ability: Grassy Terrain
EVs: 252 Atk / 6 SpD / 252 Spe
Jolly Nature
- Fake Out
- Knock Off
- Drum Beating
- U-turn

Obstagoon (F) @ Flame Orb
EVs: 252 Atk / 6 Def / 252 Spe
Ability: Guts
Jolly Nature
- Facade
- Knock Off
- Close Combat
- Obstruct

Toxtricity (M) @ Air Balloon
EVs: 252 Atk / 6 SpD / 252 Spe
Ability: Punk Rock
Jolly Nature
- Thunder Punch
- Wild Charge
- Poison Jab
- Shift Gear

Toxtricity-Low-Key (F) @ Choice Specs
EVs: 6 HP / 252 SpA / 252 Spe
Ability: Punk Rock
Shiny: Yes
Timid Nature
- Overdrive
- Volt Switch
- Sludge Wave
- Boomburst

If you want a build other than what is shown here, you can choose the listing Any Custom Pokemon.