Chansey

Astronomical HP and Special Defense, combined with the ability to use Eviolite, makes Chansey the ultimate wall in OU. Unlike that of its sister Blissey, Chansey's augmented physical bulk with Eviolite allows it to take powerful physical hits, making it a staple on defensively oriented teams. Wish and Natural Cure allow Chansey to heal its teammates and absorb status for them, while access to Seismic Toss and Toxic helps prevent it from being setup bait. Even with two ways of dealing damage, Chansey is still very passive, and because of this it is largely shut down by Taunt. Chansey's defensive typing is also rather poor for a wall, as Normal-types have no resistances and only an immunity to Ghost. Couple this with Eviolite Chansey's inability to hold Leftovers, and it is not all that difficult to wear it down. Chansey is also extremely reliant on Eviolite and loses much of its usefulness if hit by Knock Off or, less commonly, Trick. Nonetheless, Chansey is still one of the best walls in the OU metagame and is a must-use on any stall team.