Ooo. I like that so how bout this.^Max out defense, with the calm mind boost it can become a mixed wall, and they will be easy to set up with moonlight.
Focus sash is better on faster pokemon. I'd say sitrus berry or maybe rocky helmet.
Musharna@ Sitrus Berry
Nature: Sassy (It's shiny and I really wanna use it so I'm not changing the nature.)
EVs: +252 HP +252 Def +4 SP Def
So now with max defense it's doubtful Musharna will be OHKO'd but it will do hefty damage. So the Sitrus Berry heals it up so the turn it takes the damage It can heal up and use Calm Mind then the next it can use Moonlight or maybe Baton Pass.