Blissey

High base HP, great Special Defense, and a neutrality to a majority of the tier's coverage moves make Blissey a reliable wall in OU, as it is able to consistently check dangerous special attackers such as Dragapult, Nidoking, and Tapu Koko. Thanks to Teleport's great utility, Blissey can safely bring in a teammate and get momentum against your opponents. In addition, Teleport in tandem with its ability to check many special attackers let Blissey perform as an effective pivot. Natural Cure and Heavy-Duty Boots synergize well with Teleport and make Blissey hard to wear down, as it doesn't have to fear status. However, Blissey is a very passive Pokemon and is vulnerable to Taunt. Blissey is also threatened by the prevalence of strong Knock Off users such as Landorus-T, Ferrothorn, and Clefable due to its poor physical bulk and reliance on Heavy-Duty Boots to prevent it from being worn down by entry hazards.