This is 100% a CM sweeper, he's too bulky naturally not to be
Tapu Dolphin - Leftovers
252 HP/252 D - Bold
- Calm Mind
- Moonblast
- Scald/Surf
- Defog/Aqua Ring/IceBeam
I don't think you need speed EVs cuz you don't care if you get hit, and this is basically CM Suicune but arguably better...