The way to inherit nature is to give one of the parents an Everstone, it'll inherit the nature. So I suggest get a Timid parent and give it an Everstone, though you'll forfeit one of the power items.
But aside from this, like the previous answer said, you just need to soft reset continually. Save just before you get the egg, hatch it, and if the IVs aren't to your liking, soft reset & keep trying.
Also, this is assuming you're in Gen V. Breeding prior to Gen III did not have this feature, and in Gen III & Gen IV (D/P/Pt but not HG/SS), the Everstone nature inheritance only applied to the female parent.