Blissey

With Sablenite, Blissey becomes an extremely bulky wall that can sponge unboosted attacks from the likes of Primal Groudon, Magearna, and Darkrai. Because of this, Blissey can be used as a wall that can shrug off damage while providing support for its team. Blissey's pure Normal typing is also quite helpful, as it is only weak to Fighting. Furthermore, Magic Bounce from Sablenite, not only helps prevent entry hazards but also prevents it from being affected by direct status. However, due to Blissey's lackluster offensive stats, many offensive threats are able to utilize it as a setup opportunity. Blissey's passive nature also renders it useless against most opposing Magic Bounce users. However, all things considered, Blissey is still the premier wall in the tier due to its sheer defensive capabilities.