Cottonee OP move to ubers

[Cshad]

Well the only reason he needed the spiritomb to miss was to set up leech seed, and a focus sash wouldn't prevent that, plus using substitute in the first place breaks your sash.

The point of using Focus Sash is to survive the first attack so you can stall with Leech Seed and Substitute. Focus Sash guarantees that Leech Seed hits the first time he uses it. He's not going to use Substitute without Leech Seed being active.