I would like to nominate Froslass for B Rank. I freely admit that it faces major competition for Deo-D for the role of suicide hazard setting lead, which is why I think it should only be B Rank. It has its benefits, however, such as setting up on rapid spinners, and being able to run a reasonably Shadow Ball to deal with Magic Bouncers and opposing Deo-D. I've actuallly had surprising success with a Focus Sash lead with Spikes, Ice Beam, Shadow Ball, and Hidden Power Fire. This lets it OHKO or 2HKO common spinners other than Tentacruel, and some other Pokemon the opponent might switch in, like Scizor and Ferrothorn with Gyro Ball. In addition, Cursed Body and Focus Sash means that Choiced Pokemon, mainly Scarfers, are gambling each time they attack-- they can give it free layers of Spikes if their move is Disabled while Froslass is still active, or if their move is Disabled as they KO Froslass, one of your Pokemon gets an entirely free round of setup.
You just went and posted the most hellish thing I have ever seen in the history of Pokemon, right behind Swagger+Thunder Wave Sableye in hail.-- BlackLight, speaking of my Gravity Jirachi.