My friends and I are having a tournament where we all use a single type, and I've chosen ghost type. The only rule is that pokemon with bst above 600 are forbidden. I'm thinking about using...
Aegislash
Gourgeist or Golurk
Gengar or MegaGengar
MegaBanette or Sableye
Dusclops
Froslass or Chandelure

What team would you recommend? One of the guys has a dragon team and the other has a flying team