Shadow Tag Chandelure (once released):
Chandelure @Choice Scarf
- Calm Mind
- Acid Armor
- Shadow Ball
Basically, Trick your scarf onto an opponent setting up, should you come across one. Then proceed to invincibility, get a Sub up and sweep (or trick the scarf back first, if you like). At +6/+6/+6, very few things will hit your hard enough to break the Subs, and hopefully not hard enough to threaten you afterwards.
Amazing idea for a metagame, by the way!