Bad Dreams: Sleeping foes lose 1/8th max HP each turn.
Hidden
White Smoke: Can't have stats lowered by other Pokémon.
Entry
It can lull people to sleep and make them dream. It is active during nights of the new moon.
PokémonPoké.
347
ProfessorProf.
Oak
Entry
Many have reported seeing Darkrai in their worst nightmares. There have been no reported sightings of Darkrai outside of dreams, triggering speculation whether it travels through minds.