So, a thought-
Abagoora has the highest Attack of all Shell Break users, priority, and Sturdy to help it set up.
I think that, with the ability to immediately respond to potential priority by bringing your nearly-dead turtle out of the battle for a counter, this thing will be everywhere.
With a slow Tyranitar/Hippowdon lead, SS is up (meaning Hail isn't) and Abagoora, without the counter of opposing priority, will be killing EVERYTHING.
Particularly if you can get an opening for ANOTHER Shell Break.
(Unrelated aside, how does Wish work in Rotation play?)