Polteageist

Polteageist is an excellent Shell Smash sweeper due to its useful offensive typing and good stats, and the combination of Cursed Body and Strength Sap allows it to stall out, disable, and break through the majority of its checks such as Obstagoon and Snorlax. Polteageist is a great pick on hyper offense, where it can be supported properly and form wallbreaking cores with Pokemon like Lucario. However, Polteageist's shallow offensive movepool means it must pick whether it gets walled by either Dark-types or Normal-types, and it cannot hope to outlast Pokemon like Umbreon. It also relies on fishing for Cursed Body to get past its checks, and status effects can limit its longevity to the point where it isn't feasible to do so.