Prevent high bulk pokemon from having Focus Sash

I chose 300 as a sum of Defense, Special Defense and HP that would designate a high bulk Pokemon, due to being just below Dusknoir's sum of the three and I was getting Focus Sash Dusknoir, which is rather subpar.  The number could be changed if there's any better way to designate bulk.
Merge pull request #754 from Relados/patch-28

Prevent high bulk pokemon from having Focus Sash