If the Defending Pokémon is a Darkness or Fairy Pokémon, it can't attack during your opponent's next turn.
It's hypothesized that it's monitoring those who destroy the ecosystem from deep in the cave where it lives.
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Artist
If the Defending Pokémon is a Darkness or Fairy Pokémon, it can't attack during your opponent's next turn.
Switch 1 of your opponent's Benched Pokémon with his or her Active Pokémon.