Vivillon

Vivillon is an offensive Bug / Flying-type that primarily functions as a setup sweeper and a late-game cleaner. Its decent movepool features one of the best boosting moves, Quiver Dance, as well as Hurricane and Sleep Powder. Vivillon's ability Compound Eyes is also very helpful in this regard, boosting the accuracies of these moves. Vivillon also has decent Speed, as without any boosts it can outspeed threats such as Venusaur, Medicham, and Hitmonlee. Because of these traits, Vivillon works best on hyper offensive and bulky offensive builds. Unfortunately, because of Vivillon's typing, it is 4x weak to Stealth Rock and weak to a plethora of common types including Ice, Rock, Fire, Flying, and Electric. Additionally, its low bulk makes almost any neutral attack bring it down to its Focus Sash; thus, it needs entry hazard control to work effectively.