Qwilfish (101) Reverse Holofoil - Secret Wonders

Once during your opponent's turn, if Qwilfish is your Active Pokémon and is damage by an attack (even if Qwilfish is Knocked Out), you may flip a coin. If heads, the Attacking Pokémon is now Poisoned. Put 2 damage counters instead of 1 on that Pokémon between turns.