Rufflet

Rufflet was a mediocre Pokemon in XY, but SM gave it access to Brave Bird, cementing its place as a fearsome threat. Rufflet is able to hit incredibly hard because of its ability Hustle, which raises its Attack stat by 1.5. However, the downside to this ability is that all of Rufflet's physical moves except for Aerial Ace have only an 80% hit rate. Rufflet's good bulk and ways to get around traditional Flying-type counters with Superpower allow it to run good Choice Scarf and Bulk Up sets, although its mediocre Speed tier makes it unable to outspeed faster threats like Mienfoo, Chinchou, and Onix.