What is Darkrai's name? It's a mix between Dark and Kurai, which isthe Japanese name for dark. So in a way, it's name is 'DarkDark'. Darkrai is a Dark Type, It's signature move is Dark Void, and the last move it learns is Dark Pulse. It's Poke Assist in Shadows of Almia is Dark, and it's Field Move there is Dark Power. In the Trading Card game, there are 5 different Darkrai Cards. The first one is Darkrai LV.38, and is a Darkness-type card. It can use the move Darkness Pursuit with 3 Darkness Energy Cards. The second is Darkrai LV.40 and is also a Darkness-type card. It can use the move Darkness Roar with 1 Energy Card. The 3rd Darkrai is Darkrai LV.48 and is again a Darkness-type. It has the Poke-POWER Darkness Shade, it can use the attack Dark Slumber with one Darkness Energy, and can use Dark Resolve with 2 Darkness Energy and any other Energy Card. The 4th one, Darkrai LV.50 is again, Darkness-type. It's was a promotional card, and it has Spacial Rend and Roar of Time, like the Darkrai recieved from the Nintendo Event. The last one is Darkrai LV.X and, like the other 4, is also a Darkness-Type. It has the Poke-BODY Dark Shadow and can use the move Endless Darkness with 2 Darkness Energy cards and one other Energy. In Pokemon Mystery Dungeon, Darkrai is seen as an Evil Pokemon who wants to plunge the world into Darkness. Darkrai itseld is supposed to be some sort of embodiment of Darkness and/or Nightmares.
Uh... My vote is Darkrai!