Functioning as a late-game sweeper, Beautifly has the ability to clean up weakened teams with its great boosting move. Quiver Dance is a given, as Beautifly needs both the Speed and the Special Attack boost to clean up, and the Special Defense boost will help it set up against weaker special attackers, such as Alomomola carrying Scald, as well as Wartortle. After one Quiver Dance with a Timid nature, Beautifly outspeeds Zebstrika, Serperior, and Tauros. Bug Buzz is the main STAB move of choice, with good neutral coverage and a chance to lower the opponent's Special Defense. Hidden Power Ground hits the Steel-, Rock-, Poison-, and Fire-types that resist Bug Buzz. The last slot is given to Psychic, a reasonably powerful attack that hits levitating Poison-types, such as Weezing, and Fighting-types for super effective damage.
As Beautifly is 4x weak to Stealth Rock, hazard control is essential for its survival. Good choices for partners are Torkoal and Wartortle, which can both provide a free switch-in for Beautifly with Yawn. Sawk can also be used to break through most Stealth Rock leads. Natu, on the other hand, can be used to reflect hazards, though compounding weaknesses means that it will be crucial to carry Pokemon that resist Rock-, Electric-, and Ice-type attacks. A slow U-turn, Volt Switch, or Baton Pass will also help bring Beautifly in unscathed. Ampharos, Eelektross, Probopass, and Musharna work well in this case. Beautifly hates very specially bulky Pokemon, such as Audino, Lickilicky, and Mandibuzz, so Choice Band Sawk and Primeape are good partners to take out Lickilicky with Close Combat and Mandibuzz with repeated Ice Punches. Entry hazards on the opponent's side of the field are necessary to make up for Beautifly's lack of sheer power. For example, at +1, Lickilicky and Audino are both cleanly 2HKOed after Stealth Rock and a layer of Spikes. Partners such as Garbodor and Golurk are good choices for this. Beautifly needs a Life Orb to have a chance to 2HKO Lickilicky and Audino after Stealth Rock and a Quiver Dance. However, if you can keep Stealth Rock off the field, Focus Sash is an option to guarantee a Quiver Dance boost against more offensively-oriented teams.