The Unlikely Sweeper, Swift Swim Poliwrath!
I asked a few friends on discord what an underrated sweeper was, and this was the result, enjoy!
Relicanth @ Damp Rock
Ability: Sturdy
Level: 1
EVs: 36 Def / 156 SpD / 236 Spe
Bold Nature
IVs: 0 Atk
Rain Dance
Toxic
Yawn
Safeguard
Blaziken @ Focus Sash
Ability: Speed Boost
EVs: 4 Def / 252 SpD / 252 Spe
Bold Nature
IVs: 0 Atk
Protect
Swords Dance
Baton Pass
Poliwrath @ Muscle Band
Ability: Swift Swim
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
Liquidation
Close Combat
Darkest Lariat
Ice Punch
Credits:
Cianwood City Pokemon Gold Silver Remix - Mewmore
Battle! Galarian Legendary Birds Remix - Vetrom
Professor Layton's Theme and the Curious Villiage - Mewmore
Pokémon League Pokémon Diamond & Pearl 2nd Remix - Mewmore