Okay for the record, we're talking about UU SPECIAL WALLS to be used in OU.
So I don't understand your rebuttal, you attempt to correct me, as I wasn't wrong. There is no form of a special attacking breloom, so far. He is only physical, and there is no special wall designed to wall him, ESPECIALLY ONES from UU, because by definition a "special wall" is meant to wall SPECIAL ATTACKS, if it could wall him too, it would need awesome typing and maybe huge hp, but then again I fail to see why you keep coming back to cresselia. We're not talking about UU special walls taking physical hits.
While this may change, probopass (which I think is pushing towards BL, but no definitive tier list has been made so far.) has definite potential. Despite a terrible typing, he can switch very easily into a lot of attacks, forcing a switch. From there, he can magnet rise to turn a x4 weakness into an immunity, he can lay rocks, or maybe he can rock polish, use gravity, or a STAB stone edge, or possibly Bolt-Beam, and also let me mention that inside a sandstorm he can hit like, 635 or so special defense.
As a surprise, a lot of teams might not know what to do with him.
EDIT: Oh yeah, I forgot to mention HE GOES BOOM.