"Despite the sheer threat presence this set has, it can useless against most other things still be stopped by most dedicated physical walls - other Arceus, Lugia, Skarmory, and Giratina."
some grammar errors in exteme killer set, last paragraph.
http://www.smogon.com/bw/pokemon/arceus-normal
also the virizon analysis states "If one wants Virizion to act as a mixed sweeper, a Work Up set is a viable option" even though it's alrady listed as one of the options
http://www.smogon.com/bw/pokemon/virizion/ou