Moves
Swords Dance compensates for Mimikyu's otherwise average damage output, providing it with better chances to OHKO faster threats such as Latias, Celebi, and Gengar with Shadow Sneak. Play Rough is Mimikyu's most powerful Fairy-type STAB move, allowing it to beat targets such as Mega Altaria, Krookodile, and Hydreigon. Shadow Claw is its most powerful Ghost-type STAB attack and provides it with perfect neutral coverage. Shadow Sneak gives Mimikyu a priority move, compensating for its average Speed tier to revenge kill faster, weakened threats such as Latias, Terrakion, and Mega Aerodactyl.
Set Details
252 EVs in Attack and Speed allows Mimikyu to hit as hard and as fast as possible. An Adamant nature helps boost Mimikyu's damage output and claim a number of KOs that a Jolly nature misses out on, such as OHKOing Krookodile with an unboosted Play Rough after Stealth Rock and OHKOing Choice Band Scizor with a +2 Shadow Claw after Stealth Rock and one layer of Spikes. On the other hand, a Jolly nature is needed for Mimikyu to outpace non-Choice Scarf Krookodile, Nidoking, and Rotom-H, which can break its Disguise if they outspeed it, potentially costing it opportunities to set up and turns on the battlefield. Life Orb provides Mimikyu with a consistent damage output, making it the preferred item. However, Ghostium Z is a nice option, as Never-Ending Nightmare can help against Pokemon that it otherwise struggles to break through, being able to OHKO Cobalion and bulky Scizor sets at +2 after Stealth Rock, as well as doing the same to Amoonguss when running an Adamant nature. However, by forgoing Life Orb, Mimikyu misses out on a number of KOs against other threats, such as KOing offensive Mega Altaria with Play Rough and potentially taking out Gengar with Shadow Sneak after Stealth Rock.
Usage Tips
Most of Mimikyu's utility comes from its ability Disguise, so it is optimal to avoid letting Mimikyu take any hits, especially if there are offensive threats that Mimikyu can take out such as Latias. This is also applicable when trying to use Mimikyu as a spinblocker against Tentacruel or Starmie, because if they opt to attack instead of attempting to use Rapid Spin, Mimikyu's Disguise will be busted. In earlier stages of the game, Mimikyu should be used to revenge kill slower foes with Play Rough or Shadow Claw and revenge kill faster, weakened foes with Shadow Sneak, but it can also be used to switch in on Pokemon that it can comfortably check such as Latias and force them out. Mimikyu can also prevent opposing Pokemon from sweeping teams such as by KOing a boosted Mega Altaria with Play Rough or KOing a boosted Celebi, as it is guaranteed to survive a hit thanks to its Disguise. If Mimikyu is able to avoid situations where its Disguise has been broken, it can also potentially be used as a late-game cleaner, using its Disguise as a free opportunity to boost its Attack stat with Swords Dance, allowing it to break through bulker targets such as Hippowdon more easily and to KO faster foes from full with Shadow Claw such as Latias, Celebi, and opposing Mimikyu as long as their own Disguise is busted.
Team Options
Mimikyu is a staple Pokemon on hazard stacking teams, as it's immune to Rapid Spin, and entry hazards allow Mimikyu to claim a number of KOs that it normally would struggle to get, leading to it often being paired with hazard setters such as Froslass and Araquanid or offensive Stealth Rock setters such as Cobalion, Mamoswine, and Terrakion. It can also be used on bulkier teams as an offensive Fairy-type, commonly in place of Mega Altaria when the Mega slot has been filled by another Pokemon, filling the role of a much-needed check to threats such as Latias and Mega Altaria. Checks to Steel-types are mandatory for teams with Mimikyu, as it struggles to break through them and is KOed by all their Steel-type attacks. Noteworthy examples of these checks are Cobalion, Infernape, and Lucario. Cobalion is also able to provide an offensive Stealth Rock setter, while Infernape and Lucario significantly improve the team's matchup against stall, as they're both able to OHKO Quagsire with All-Out Pummeling after Stealth Rock or comfortably 2HKO it with Life Orb-boosted Focus Blast. All of these are also able to improve the matchup against Dark-types such as Hydreigon and Sharpedo. Other wallbreakers that commonly find themselves on hyper offense teams tend to perform well with Mimikyu. Dragonium Z Latias pairs brilliantly with Mimikyu, as it's able to take out Quagsire due to it ignoring Latias's Special Attack drops from Draco Meteor while pressuring Blissey with Psyshock and Steel-types with Hidden Power Fire. Mega Sharpedo can act as a valuable late-game cleaner while also being able to comfortably pressure Ghost-types that Mimikyu dislikes such as Gengar and Chandelure.