Xatu

Xatu is primarily known for its ability Magic Bounce, which allows it to bounce back moves like Will-O-Wisp, Toxic, and Taunt and more importantly allows it to bounce entry hazards back to the opponent's field. Xatu has a very good matchup against two common hazard setters in Uxie and Registeel, while its access to U-turn also allows it to act as an effective pivot. Furthermore, Xatu's Psychic / Flying typing gives it a 4x resistance to Fighting and a Ground immunity. It has a decent Speed tier even without investment, allowing it to invest in bulk. It also has a vast movepool, with moves such as Heat Wave, Grass Knot, Night Shade, and Roost. Unfortunately, Xatu is weak to a variety of types including Dark, Rock, Ice, Electric, and Ghost. Furthermore, all Dark-types other than Spiritomb outspeed Xatu and can threaten it with a combination of Knock Off and Pursuit. The popular hazard setter Diancie can be troublesome due to the combination of Heal Bell and Diamond Storm. If the opponent finds out the moveset Xatu is running, it becomes relatively easy to check. Finally, Pokemon like Drapion, Scrafty, and Fletchinder can take advantage of Xatu and set up on it.