Skarmory

Skarmory has always been one of the top physical walls in the game, and it has managed to retain these bragging rights even in a metagame infested with Shadow Tag Chandelure. Skarmory's absurd physical bulk, excellent typing, and access to Spikes all make it an incredible team supporter. It can wall threats that Ferrothorn could never dream of handling while supporting its team, and it can even disrupt other walls if need be. It's a fantastic wall and easily one of the biggest hurdles for sand teams to overcome, walling menacing Dragon-types and threats such as Excadrill and Garchomp. To put it bluntly, Skarmory is probably the best Steel-type wall in Dream World.