Looks interesting, but what else can she do? Seems to me like a Bulky CM set would be king over this.
Just switch into something that it setup bait for her and CM up, then destroy. Then proceed to wreck a bunch of shit with her being all set up like that.
Specs is the best set because it gives Gothitelle the immediate power to break through the things it is trying to remove, e.g. Politoed. Scarf can also work out as a revenge killer, yet is unable to trap and KO defensive threats so easily.
CM sounds nice on paper but it'll never work in practise because Gothitelle is just too slow to sweep, and even with maximum investment in Defense, it is still nothing exceptional on the physical side.