I suggest this Eternatus @ Black Sludge
EVs: 252 HP / 4 SpA / 252 Spe
IVs: 0 Atk
- Cosmic Power
- Mystical Fire
Pressure stall. Cosmic Power raises defenses, Toxic wears down anything other than Poison and Steel types, Recover is a recovery move, and Mystical Fire takes out Steel types.