Shedinja

With an amazing defensive ability in Wonder Guard, Shedinja is immune to any attack that isn't super effective against it. This ability allows Shedinja to take on numerous threats in the tier such as Suicune, Cobalion, and Snorlax. Even with the ability to take on these threats, though, Shedinja is weak to some of the other common types in the tier such as Dark, Fire, and Flying. At first glance, Shedinja's stats may also not seem that great, especially its lowly base 1 HP, which means that it is instantly KOed by passive damage from entry hazards and status moves such as Toxic, Will-O-Wisp, and Leech Seed. As such, Shedinja should be put on a team built around it with many entry hazard removers and possibly Magic Bounce users such as Espeon and Xatu.