Gonna share something another anon posted in a past thread.
Beep Boop (Regice) @ Assault Vest
Ability: Clear Body
Level: 50
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Ice Beam
- Thunderbolt
- Focus Blast
- Flash Cannon
High special defence, but relies on landing super-effective hits to deal damage. It can't tank physical hits so well, but that's what the rest of your team is for.