Swampert @Leftovers
Trait: Torrent
EVS: 240 HP/216 Def/52 SpDef
~Stealth Rock
~Earthquake
~Ice Beam
~Hydro Pump
Defensive swampert is about the only thing that can switch in and not take a bunch of damage from either of the STAB attacks. Rotom could work too, but I'm not sure how well it absorbs CB Rock Blast.