Take a look at this thread, you'll find a section for scarf users. Out of these, I'd say Pokemon like Gardevoir, Chandelure, and Darmanitan are fairly common scarfers you can run into on ladder. Rillaboom was a pretty common Scarfer but CB and SD sets have become a lot more popular nowadays. Generally speaking, most teams in UU rely on priority, T-Wave, and faster Pokemon like Noivern for Speed control but some of those in that thread can be worth using when needed. I hope this helps.What are common Scarfers in UU?