Blissey

Blissey has been the premier special wall since her release in GSC. It's not difficult to see why: Blissey has an absurd amount of Special Defense, the highest HP stat in the game, and an incredible support movepool. But it's not all good news for Blissey; her Defense stat is pitiful, and her offensive stats are mediocre to say the least. To make matters worse, Eviolite makes Blissey's pre-evolution, Chansey, much bulkier than she is. However, Blissey does have some advantages over Chansey, namely a usable Special Attack stat and the ability to choose between Shed Shell and Leftovers. Unfortunately, Blissey is setup bait for many competent DW threats, such as Excadrill, Keldeo, and Chandelure. Don't let these faults deter you from using Blissey, though, as she can wall many of the threats in the DW metagame.