I would run Max Lightning in doubles, because it can definitely do a benefit for your your other Pokemon such as help Bolt Beak on Draco/Arctozolt with it's already superior 160 Base power when Dracozolt moves first boosted by Hustle boosted by a Choice Band boosted by stab boosted by super effectiveness (if it is). And other benefits too. I know Stun Shock will Poison/Paralyze both opponents, but Electric Terrain is much more beneficial. But in singles, it's a choice. Also good answer.