I'm not entirely sure about where this would go, but I know I have been running Slowbro in OU in a core with Charge Beam Blissey, and has been working very, very effectively. I know that Slowbro has been placed in UU, but I genuinely think that it has massive capabilities in OU. Utilising Calm Mind, Slowbro can pick up an uninvested Sp.Def stat of about 400-600.
After one Calm Mind, Slowbro's Sp.Def becomes 294 (uninvested, neutral nature). (1.5x)
After two, its Sp.Def is 392. (2x)
After three, it is 490. (2.5x)
After four; 588. (3x)
Five: 686 (3.5x)
Six: 784 (4x)
I know any Pokemon's Sp.Def stat can explode after six Calm Minds, but thats not my point. My point is, after two very easily achievable Calm Minds, it picks up a Sp.Def stat higher than Blissey's max. If Slowbro faces a physically strong Pokemon, it will do next to nothing. It has become my most common Scizor counter, as Bug Bite/U-Turn will only do about 10-22% when at +0 attack. Its ridiculously easy to set up Calm Minds, and when used properly, can wall out a large proportion of the Meta. Coming with its own recovery move, Slack Off, it can 'sweep' most teams, and tank out everything that opposes it.
I can show a demonstration if you want to see, skip to Turn 27. I was given a bit of trouble from a parashuffling Dragonite in the previous turns, but managed to do a Slowbro 'sweep'.
Skip to Turn 27, http://pokemonshowdown.com/replay/ou3717384