yeah encoring mushy seems really cool. At first I was thinking it wouldn't be too cool cause everyone carries a mushy counter and the mushy user will probably predict a switch to the mushy counter anyway but once sub is up, they might think you'll at least wait to have your sub brokem idk. The thing that worries me though is dynamic punch is doing pitiful damage to mushy and so it can just stay in and wait for you to have to encore again then switch without taking a dpunch to a non-mushy mon. Payback can kind of make up for it but you're faster and if he switches while you payback, it will do very few damage and then he can just switch mushy back in and psychic.