Thanks for the advice. I get where your coming from. Normally, i dont use this set, i use a set like the one you mentioned but recently i want to try out new sets for fun and shit.
So i made this gengar setup which is kinda op in pvp
Item: Wide Lens
EVS: 252 Speed and Sp Atk
Nature:Timid
Ability: Cursed Body
-Hypnosis (for hex and dream eater)
-Hex (with hypnosis it does 130 dmg plus STAB)
-Dream Eater (Hypnosis and gains hp)
-Destiny Bond (if all else fails)
Tell me if you have any improvements