He actually has quite a viable CBzor there.
So thats fine.. don't change it to a CBzor.
Also regarding your CBzor EVs, you want 32 Hp 252 Atk and 224 Spe to outrun Max + TTar.
Shadow Ball definitely better than Sludge Bomb, so keep eet.
If you're going to run Sub on your Dos, then run Bounce...