I got a rain team that's been doing well on the ladder for me. The main three stars here are AV Melmetal, phys def Counter Swampert, and then the demon himself, Mystic Water Crawdaunt. Running max HP so you can take a hit and SD, and Mystic Water is basically the same as Life Orb but now you're not on a timer, so you can just spam Aqua Jet.
https://pokepast.es/ebf28dba10a02c9b