If you are doing the Azura's shrine quest, then there should be about four will O the wisp's in that area. Other than the that, the only place I could find the will O the wisp dust or remains was in the imperial market district at the alchemy shops. Hope that helps :)
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serebii.net has alot of info on Pokemon
my opinion is the following: flamethrower, fire blast, will-o-wisp, and overheat.
you can find them in lake arrius caverns
You should use something like wine to play Oblivion on a mac. You can find it very easy on google. That or just wait until Oblivion comes out for the Mac (if that ever happens).
Dusknoir@leftovers Pain split will o wisp ice punch/fire punch/thunderpunch shadow sneak/shadow punch