Dusknoir

Dusknoir (ヨノワール Yonoir) is a -Type Pokemon, and is the final evolution of Duskull. In Generation IV, Dusknoir can be seen in Victory Road during a battle with Psychic Valencia, and can be obtained by trading a Dusclops with the item Reaper Cloth.

In the Anime
In Ghoul Daze!, it guards a tunnel that leads into the spirit world. Dusknoir prevents a rebel ghost child taking humans into the spirit world, saving Ash and his friends.

Pokémon Mystery Dungeon
In this game, Dusknoir plays a good guy in the beginning, when you first meet him. He saves you a few times too. But when you capture the "evil" Grovyle (who's really your partner when you were a human), Dusknoir grabs you and your partner and drags you into another world. You end up battling him and several Sableye before going to Temporal Tower.

Name Origin
Dusknoir's name is composed of two words. The first is "dusk" which means afternoon and "noir" which is french for black.