Darkrai is a black, shadow-like Pokémon. It has a small head with a white fog-like ghostly plume billowing from its head covering one of its bright blue eyes, with the portion on its face resembling hair. It also has a red spiky growth around its neck. It has skinny arms and long black tatters hanging from its shoulders... blah blah blah. I mean, why so people use "it" so much? After a while it gets SO boring, Can't they just say Darkrai has skinny arms with long black rags hanging off it's shoulders. But anyway... here's my own description:

Cubiemon Cubiedex: Darkrai is a shadow type legendary cubiemon, and one of the lunar duo along with Cresselia. Darkrai mostly appears at night, but is rarely seen in day. When it is nearby, Darkrai can cause people to have nightmares.

However, if you do not like my amazing writing skills, the link to the bulbapedia entry is below.

http://bulbapedia.bulbagarden.net/wiki/Darkrai_(Pok%C3%A9mon)