Now, some of you might know that I'm from a forum that encourages the use of UU Pokemon in OU, and also encourages making original sets whenever posible. While some sets are completely new (and haven't really had any proper testing so they don't work as well as the theorymonning suggests), some are simply subtle adjustments of Smogon sets. One of these sets, which, coincidentally, 3 of us came up with more or less at the same time (and indepentently too!) is a mixture between two Clefable sets, and has proven to be reliable enough for OU usage. If you've seen any of my recent videos, you'll know this set. So, I present... The ONM Clefable!
ONM Clefable
Calm/Adamant Nature (personally I run a bulky version, but an offensive version can work too)
252HP/252atk/4sp.def (offense), 252hp/252sp.def/4atk (bulk)
@Toxic Orb (the key to this set)
Magic Guard (for obvious reasons)
-Protect
-Softboiled
-Trick
-Facade
Now, I know what you're thinking. 'It's just a Toxic Orb Clefable with Trick!' But it works. OK, so ghosts can come in and wall it, especially Gengar (because it can't be poisoned), but this set deals with one of the most annoying special attackers in OU: Latias. Come in on an attack, or as revenge, Protect (to activate toxic orb to aviod status), trick the Toxic orb and get a free item! Even if you end up getting Choice Specs, it's not all bad news, because you can come in later on and trick something else!
It can work well as a lead, or just as a general special wall. Personally I use it as my wall, but one of the other guys uses it as his lead, and it's just as effective.