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I have won multiple battles simply because the opponent grossly misjudges what Vivillon is capable of.
>bring in Vivillon as my last pokemon, expect to eat an attack from my definitely-faster opponent and get OHKOd
>uses a recovery move to patch up prior damage
>eats a Sleep Powder
>sweep
>a different battle, bring in Vivillon
>opponent switches into something else that may or may not be more effective at punching through Vivillon's silk paper defenses
>eats a Sleep Powder
>sweep