Moves
Swords Dance boosts Pancham's Attack, allowing it to effectively break down the opponent's walls. Drain Punch is Pancham's main STAB move, as it complements its solid natural bulk by giving it recovery. Knock Off hits the Ghost-types that are immune to Drain Punch and removes the foe's item, giving Pancham nice utility. Gunk Shot hits Fairy-type switch-ins such as Spritzee, Snubbull, and Cottonee very hard, OHKOing Cottonee and 2HKOing Spritzee and non-Berry Juice variants of Snubbull. Alternatively, Zen Headbutt hits Poison-types such as Mareanie, which is always 2HKOed by it, and Fighting-types such as Mienfoo and Timburr, which are nearly always 2HKOed, super effectively.
Set Details
Eviolite is the item of choice, as it enhances Pancham's solid bulk, giving it more opportunities to set up. 180 Attack EVs with an Adamant nature maximize Pancham's Attack, allowing it to dent the opponent's team as much as possible while getting the maximum possible HP back from Drain Punch. The Defense and Special Defense EVs give Pancham good bulk, allowing it to survive +2 Shellder's Icicle Spear and Focus Sash Abra's Psychic. If Pancham's teammates can provide Sticky Web support, an alternative spread of 180 Atk / 20 Def / 52 SpD / 252 Spe should be used, as it hits 14 Speed, allowing Pancham to outspeed the entire unboosted metagame after Sticky Web. Mold Breaker is used to remove items from Sticky Hold users such as Trubbish with Knock Off and bypass Magnemite's Sturdy to OHKO it. Iron Fist is also an option to 2HKO Alolan Grimer and OHKO both Doduo and Archen after Stealth Rock. It also guarantees the OHKO on Alolan Grimer and Abra with Drain Punch after one Swords Dance.
Usage Tips
Pancham should be brought in on Pokemon it threatens out, such as Pawniard, Ferroseed, and Tirtouga. The opportunities created by these forced switches should be used to dent the opponent's switch-in and remove items in the early-game. In the late-game, these opportunities should be used to set up a Swords Dance to sweep the opponent's team or remove walls for your sweeper. If Pancham is being used as a wallbreaker for your team, setting up a Swords Dance can be useful, as it allows Pancham to power through walls even more quickly. Since Pancham will usually not be using Drain Punch on forced switches with this set, it tends to be worn down very quickly. As such, it should not be used as the primary counter for any Pokemon, but should instead focus on wallbreaking with the power boost from Swords Dance. If your team has Sticky Web, Pancham should be preserved until the late-game in order to set up a Swords Dance and sweep the opponent's team.
Team Options
Pancham greatly appreciates Sticky Web support from Pokemon like Surskit and Spinarak, as it allows it to outspeed most of the opponent's team and potentially sweep in the late-game. Other Knock Off users are also appreciated, as they can remove Eviolites, giving Pancham an easier time wallbreaking, and Choice Scarves, allowing Pancham to clean more easily in the late-game on a Sticky Web team. Another Fighting-type such as Mienfoo can work very well with Pancham. Thanks to them sharing counters and having powerful attacks, those counters will often be worn down over the course of a match, meaning it will be unable to counter both. In addition, the two will also easily be able to deal with Dark-type cores. Pivots such as Chinchou, Mienfoo, and Foongus work very well with Pancham, as they can get it in on a free switch quite easily. Chinchou also deals with the Flying-types that threaten Pancham and are immune to Sticky Web. Pursuit users such as Munchlax and Alolan Grimer can trap Psychic- and Ghost-types for Pancham, giving it an easier time cleaning. Diglett is also a great partner for Pancham, as it can trap and KO the Poison-types that wall it, such as Mareanie and Trubbish. Lastly, since Pancham is weak to burns, it appreciates a cleric like Spritzee or Chinchou. The former of these can also pass Wishes to Pancham, improving its longevity, thus allowing it to wallbreak for longer over the course of a match, while the latter is capable of pivoting into Pancham with Volt Switch.