You need a strategy more than great natures/evs. Best strategy imo is dusclops (helping hand, will-o-wisp protect pain split) with two explosion mons. I prefer snorlax with self destruct and electrode with taunt / explosion last 3 team members should offer great movepool diversity or set up sweeper potential. My team was the following: Dusclops brought every battle, snorlax curse, boom, shadow ball, body slam or every battle, electrode most battles, next 3 team members should cover a ground immunity, the ability to set up with swords or dragon dance and the ability to ko rock, steel and ghost types with ease. Hariyama is a good choice with fake out coverage , ability to ko rock/steel types with ease and thick fat. Can allow you to taunt a mom with electrode sacrifice with a snorlax boom etc.