Ever since the 3rd gen, Shedinja's been my all-time favorite Pokemon in existence. I'm glad to see others looking into 5th gen possibilities for it already. My current 4th gen Shedinja is Naughty with a Focus Sash(I figure that with 1 HP, Lonely or Naughty would work). Of course it has the common X-Scissor/Shadow Sneak/Swords Dance.
However, as far as I read, I haven't heard of anyone here using Swagger as an option. I just figured that, if Shedinja's only got 1 HP, why not be afraid to boost the opponent's stats just for the off chance they'll hurt themselves. The damage would be stronger if they do. That's how mine is set up, and its worked just peachy for me. Now, with Claw Sharpen, I can just take out Swords Dance and have better accuracy with Swagger.