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Swellow is the fastest Whirlwind user in the game. Meaning, it's the best Whirlwind user in the game. This, combined with it's Scrappy ability, allows it to check Ghost-Type setup threats like Mimikyu and Blacephalon
Choice Scarf makes it even faster, meaning it will outspeed just about anything. This makes it's Quick Attack one of the fastest priority moves in the game, which is able to hit every Pokemon because of it's Scrappy ability. If power is needed, then it also has an extremely fast Giga Impact it can use, to take out bulkier threats. Finally, Hurricane surprises physically-defensive mons with a powerful STAB special attack. This is extra useful for taking out physical walls like Tangrowth
