Festival Grounds (Twilight Masquerade 149/167)

Rules

Each Pokémon that has any Energy attached (both yours and your opponent's) recovers from all Special Conditions and can't be affected by any Special Conditions.

You may play only 1 Stadium card during your turn. Put it into the Active Spot, and discard it if another Stadium comes into play. A Stadium with the same name can't be played.