Shedinja

Shedinja's ability, Wonder Guard, is like no other, allowing it to dodge every move that isn't super effective; the ability can be amazing late-game. Wonder Guard also grants Shedinja the ability to take on threats in the metagame such as Simipour, Raichu, Regice, and Rotom-F. Though Shedinja has many immunities, it's also weak to some of the most common types in the tier. Also, its abysmal HP stat will always stay at 1, no matter how much you invest in it, meaning that Shedinja is instantly KOed by the likes of entry hazards, Toxic, burn, Leech Seed, and weather conditions such as hail and sand. Shedinja needs to be put on a balanced team that is built around it to function to the best of its ability. Offensive entry hazard removers don't have the bulk required to switch in and use Defog, and because there aren't good Magic Bounce users in PU, barring Natu, using Shedinja can become difficult when done incorrectly, especially in an entry hazard-based metagame. Swords Dance doesn't turn Shedinja into the tier's best sweeper but, with its unique ability, Shedinja can still be a thorn in the side of teams that lack the tools to properly handle it.