Wring out looks like an interesting option, probably mentioned at some point though
it hits full health targets for 120, meaning if you swap in for an easy kill with leaf storm and they swap say salamance in to tank the shot, you have a 76% chance of killing it with wring out
in fact, due to the nature of the move, a life orb + nature max EV +2 serperior should have 76% chance of killing salamance with wring out regardless of its health i think
it may not be the best, but having it means you can use a hidden power to hit steel types and get coverage on everything, so you arent walled by steel types and can at least do something to dragons, and if you can get a second boost somewhere, it should be enough for hidden power+leaf storm+wring out to kill anything easily