Trick Room

Trick Room is a move where the slowest Pokemon goes first for 5 turns. This can totally mess up some people's strategies. Slower Pokemon like Swampert, Bronzong, Tyranitar, Scizor, Rhyperior, Snorlax, Magnezone, Machamp, Hippowdon, Blissey and others will speed ahead of other fast sweepers like Salamence. A good Sandstorm/Trick Room team is Bronzong, Tyranitar, Rhyperior, Magnezone, Scizor, and ether Hippowdon or Swampert. Marowak also can be a beast in trick room with its attack. But bewarem, this only lasts 5 turns so keep you Trick Roomer alive.
Most psychics can learn this move.