Diamond: It can lull people to sleep and make them dream. It is active during nights of the new moon.
Pearl: Folklore has it that on moonless nights, this Pokémon will make people see horrific nightmares.
Platinum: To protect itself, it afflicts those around it with nightmares. However, it means no harm.
Heartgold: It chases people and Pokémon from its territory by causing them to experience deep, nightmarish slumbers.
Soulsilver: It chases people and Pokémon from its territory by causing them to experience deep, nightmarish slumbers.
Black: To protect itself, it afflicts those around it with nightmares. However, it means no harm.
White: To protect itself, it afflicts those around it with nightmares. However, it means no harm.
Black-2: To protect itself, it afflicts those around it with nightmares. However, it means no harm.
White-2: To protect itself, it afflicts those around it with nightmares. However, it means no harm.
X: It chases people and Pokémon from its territory by causing them to experience deep, nightmarish slumbers.
Y: It can lull people to sleep and make them dream. It is active during nights of the new moon.
Omega-Ruby: It chases people and Pokémon from its territory by causing them to experience deep, nightmarish slumbers.
Alpha-Sapphire: It can lull people to sleep and make them dream. It is active during nights of the new moon.
Legends-Arceus: On a moonless night, a strange incident occurred in which every one of a village's inhabitants suffered nightmares. The villagers attested that Darkrai appeared before them in these nightmares.