Can I only use Illumise's "Slowing Perfume" attack on my first turn if I go second?
Yes. That attack is restricted to that one and only time.
Slowing Perfume



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Slowing PerfumeYou can use this attack only if you go second, and only during your first turn. Shuffle 1 of your opponent's Benched Pokémon and all attached cards into their deck.

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Can I only use Illumise's "Slowing Perfume" attack on my first turn if I go second?
Yes. That attack is restricted to that one and only time.