Focus Sash(ha ha... my favorite strategy)
personally, I don't like Shedinka that much. it has way too many weaknesses along with the number of T-tars, Hippowdons, and Abomasnow running around these days. And the number of status inducers.
feej... ha ha... fun word
EDIT: WTF? did I really put "Shedinka?"
These are the advance generation forums not Diamond/Pearl mind you.