Vivillon

Vivillon is able to distinguish itself from other setup sweepers with an accurate Sleep Powder courtesy of Compound Eyes, allowing it to cripple its checks or present itself with a safe opportunity to set up Quiver Dance. When combined with its passable offensive stats and ability to achieve multiple boosts, Vivillon is capable of becoming a potent setup sweeper. Unfortunately, Vivillon's terrible bulk compounded with a poor defensive typing that comes with a 4x weakness to Stealth Rock limits its opportunities to enter play and set up and makes it vulnerable to numerous priority users like Golisopod, Lycanroc-D, and Zygarde-10%. Furthermore, even after a boost, Vivillon fails to break past specially bulky Pokemon like Snorlax and Goodra as well as close the gap between particularly fast Choice Scarf users such as Flygon and Houndoom, which means it requires a considerable amount of preparation and team support to successfully pull off a sweep. Lastly, Vivillon contests with Pokemon like Ribombee and Yanmega as offensive Bug-types, as their superior Speed tiers and immediate offensive pressure can be used to break apart teams with more ease. Other setup sweepers such as Salazzle and Virizion require less support to function and are much harder to stop with boosts.