Misty Terrain

Lasts 5 turns (8 with Terrain Extender). Grounded Pokémon can't be burned, paralyzed, poisoned, put to sleep, frozen or confused. Dragon-type moves deal half damage to grounded targets.

Only one terrain can be active at a time: a new one replaces the old one. "Grounded" means not Flying-type and without Levitate or Air Balloon.