Lack of multiple Ghost-types and inclusion of FABULOUS Darkrai makes this thread fail on so many levels.
Regardless, Giratina or Dusknoir are my favorites and neither are in this poll, nor are Spiritomb or Drifblim, the next candidates...Really, you missed a lot. Go to Serebii and look up all the Ghost-types...
Given this poll's limited options, I went with my favorite, Banette. Because it's cool and stuff.