Ninjask

On account of its incredibly high Speed, which is only further supplemented by Speed Boost, Ninjask is the fastest Pokemon in PU. This, alongside its access to U-turn, lets Ninjask serve as both a capable revenge killer and an effective offensive pivot. Swords Dance adds to the list of roles that Ninjask can fulfill, turning it into a sweeper that can be annoying to play around thanks to Speed Boost. However, despite having fairly powerful STAB moves, Ninjask is not particularly strong before setting up due to its mediocre Attack. Ninjask's bad bulk and weakness-laden typing also tend to limit its setup opportunities to forced switches, and it is vulnerable to priority users like Sneasel and Lycanroc.