Pokémon Power: Transparency - Whenever an attack does anything to Haunter, flip a coin. If heads, prevent all effects of that attack, including damage, done to Haunter. This power stops working while Haunter is Asleep, Confused, or Paralyzed. Nightmare - The Defending Pokémon is now Asleep. Because of its ability to slip through block walls, it is said to be from another dimension.