Sismic toss
Will-o-whisp
Pain spilt
Confuse ray.
Dusclop's attack stinks, it's like blissy, but with high defence instead of HP, and is ghost type. So, you should inflict status, then, sismic toss, then, when a new poke comes out, pain split to heal, and hurt them.
Put EV's equally into defences, and some in speed.
Try a nature that lowers sp.attack, or attack, and raises either defence.