Leftovers Defiant Adamant
~ Swords Dance
~ Sucker Punch
~ Substitute
~ Low Kick / Iron Head
52 HP / 252 Atk / 204 Spe
The goal of this set is simple. Begin by obtaining a Swords Dance boost. Throughout the following few turns, murder everything. It's really that simple. Swords Dance boosts Bisharp's Attack stat to legendary levels, allowing him to power through almost every Pokemon in the tier. Sucker Punch is used as Bisharp's main attack, boasting STAB and priority, as well as hitting extremely hard after a boost. While unreliable, it is an invaluable tool for Bisharp to threaten the many Pokemon that could otherwise revenge kill him.
Substitute partners well with Sucker Punch, letting Bisharp take advantage of the turns where the opponent tries to avoid getting hit with Sucker Punch by using a non-damaging move, hence ending any mind games that may ensue after Bisharp has received a boost. In addition, having a Substitute up encourages the enemy to attack and break it, allowing for more opportunities to use Sucker Punch successfully. Low Kick is the best choice for the last move, achieving almost perfect neutral coverage in UU alongside Sucker Punch, missing out only on Heracross. Iron Head is a possibility for the last moveslot, being just as strong as Sucker Punch after STAB and much more reliable. In addition, after a Swords Dance, Iron Head obtains numerous KOs, assuming the opponent does not resist it and Bisharp outspeeds or is behind a Substitute.