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Have: Umbreon (Sassy), Metagross (Sassy, and in my opinion it's actually the best nature because of Assault Vest and Gyro Ball), Manectric (Modest), Skarmory (Brave), Spheal (Modest).
Looking for: Gastly, Ponyta, Miltank, Ralts (Don't care about gender), Nincada, Zorua, Litwick, Froakie, Honedge.
All offers welcome, so long as they include, but don't necessarily have to be limited to, shinies.