Glass Cannon on Wheels (Doubles):
Barraskewda @ Assault Vest / Life Orb
Ability: Swift Swim
Nature: Jolly (+Speed, -Special Attack) or Adamant (+Attack, - Special Attack)
EVs- 252 Atk / 252 Spd / 4 Def or HP
-Liquidation- STAB & lowering Defense
-Close Combat- Power
-Ice Fang / Psychic Fangs- Ice Fang for fishing for flinch or freeze, Psychic Fangs for destroying screens.
-Poison Jab / Drill Run / Crunch- Poison Jab for covering grass weakness, Drill Run for covering Electric weakness, or Crunch for lowering Defense.
Barraskewda is an excellent physical sweeper. Swift Swim makes it's already insane Speed stat double again, so Pelipper is a go to partner (but I use a Prankster Sableye with Rain Dance because it has a great supportive Pokemon movepool other than Rain Dance). Using a Life Orb can increase Attack stats (with the cost of a little health), or you could use an Assault Vest, for a more specially defensive approach.
Barraskewda is my personal favorite Galar Pokemon. Because of its amazing Attack and Speed, it can be used for insta-kills. But like every Pokemon, Barraskewda has it's weaknesses, and Barraskewda's is its fragility. It has abysmal HP, Defense, and Special Defense stats, which make it very killable. Other than that, just use your speed to kill opponents before they kill you (watch out for Trick Rooms).