Magnezone

Magnezone's main niche in Ubers is its Steel-type trapping ability. Much like in OU, there are many Dragon-type sweepers in Ubers who appreciate the removal of Steel-types who impede their sweeps, and the fact that far fewer Steel-types in Ubers carry Ground-type attacks coupled with the fact that the use of Shed Shell is all but nonexistent, Magnezone can often open up massive holes in your opponent's team. Also, its unique defensive typing grants it resistances to many popular attacking types in Ubers, including Dragon-, Steel-, Bug-, Ghost-, and Dark-types, as well as the famous BoltBeam combination. Magnezone isn't without its weak points, however. It is very slow without a Choice Scarf and it is weak to the common Fire-, Ground-, and Fighting attacks that a lot of Ubers sweepers tend to carry. It also does not have any recovery outside of Rest to help it stand up to repeated hits. However, while Magnezone may sometimes be overlooked in the Ubers environment, it is certainly not to be underestimated.