Lately I've been threatened by Malamar since it can easily build up boosts against slower, bulkier teams. However, Malamar is still pretty prone to being worn down by status. Which is why this particular Malamar is pretty underrated imo.
Malamar @
Chesto Berry
Ability: Contrary
EVs: 48 HP / 252 Atk / 208 Spd
Adamant Nature
- Superpower
- Night Slash
- Psycho Cut
-
Rest
This works particularly well on Malamar since it has already done quite a bit of damage to rack up boosts while the opponent wears away at it. Then you can drain all their hopes away with one click of a button, so this Malamar can feasibly set up in the face of burns and Toxic. I also cut down the Speed EVs because 0 Spe Sigilpyh doesn't exist, but still outspeeds the fastest relevant grounded threat which is Virizion if Sticky Web is in play (either your or your opponent's side).
Edit:
Zebraiken Upped the Speed for Ant, though Malamar cannot OHKO even at +2 >:( so you probably want to get rid of it first.