Concept: Stat-Upper Counter
Description: A Pokemon that is able to counter many of the common stat-uppers of OU, such as Bulk Up Revanankh, Swords Dance Lucario, and Tail Glow Syclant, whether by typing, an ability such as Unaware, or use of moves like Psych Up, Heart Swap, or Punishment.
Explanation: I originally had an idea for a pokemon that would "counter" the opponent's statups (for example, as long as the opponent had +2 Attack, it would have +2 Defense) or that would reverse them (while it was in play, stat boosts would be equal drops, and drops would be boosts), but then I realized that these abilities might be too specific and/or broken.
EDIT: Neoplan's idea is sorta similar.