The complete Pokemon Diamond and Pearl pokedex, part 10

Pokémon Name: Darkrai
Type: Dark
Classification: Darkness
Pokédex Number: 491 National
Ability: Bad Dreams – Sleeping opponents lose health every turn
Useful Attacks: Dark Void
Location Found:
D/P/P: New Moon Island, accessible only by event
HG/SS: Trade with D/P/P
B/W: Poke Transfer

Darkrai is the second of Pokémon Diamond and Pearl's event Pokémon, a scheming specter. Not much is known about this mysterious diplomat of darkness, only that it beckons trainers to New Moon Island with bad dreams. Its signature move, Dark Void, can put both of its foes to sleep, setting them up for damage from Darkrai's innate ability and its powerful Nightmare and Dream Eater attacks.