Moves
Shadow Sneak supplies Dusknoir with a STAB-boosted priority move, letting it bypass its poor Speed stat and strike Psychic-types like Grumpig and Kadabra super effectively. Sucker Punch provides Dusknoir with a second priority attack that is used to hit faster Normal-types like Dodrio and Chatot. It is stronger than Shadow Sneak, but its successful use is dependent on your opponent also selecting an attack. Earthquake supplies Dusknoir with great neutral coverage alongside Ice Punch and lets Dusknoir check Pokemon weak to Ground-type moves, such as Arbok, Stunfisk, and Monferno. Ice Punch hits Dragon-types like Altaria and Gabite and physically frail Grass-types like Roselia and Jumpluff much harder than its other moves would while simultaneously preventing Dusknoir from being walled by Vullaby. Pursuit is a final option that allows Dusknoir to trap physically frail Pokemon, especially Cryogonal and Kadabra, and creates a dangerous guessing game when used in tandem with Dusknoir's priority moves wherein your opponent will be forced to question whether it's safer to stay in or switch out against Dusknoir.
Set Details
Its EV spread and nature maximize Dusknoir's Attack, while the given Speed lets Dusknoir outspeed neutral-natured base 50 Speed Pokemon, such as Klang and Audino. Dusknoir is able to run slightly more Speed in order to score a 2HKO on non-Eviolite Vullaby on the switch with a faster Ice Punch. Its remaining EVs should be allocated towards its bulk, which allows it to tank a wide array of neutral hits. Life Orb will boost Dusknoir's offensive presence while letting it switch between moves. Pressure is Dusknoir's only possible ability with this set because Frisk and Sucker Punch form an illegal combination together. Pressure can be used to stall out low-PP moves like Focus Blast and Superpower.
Usage Tips
Dusknoir should use its Ghost typing to switch into Rapid Spin in order to preserve any entry hazards its teammates may have set. If Dusknoir is healthy and using Pursuit, it should use the opportunity after it has blocked Cryogonal's Rapid Spin in order to Pursuit trap it. Pursuit can also be used against offensive pivots reliant on Volt Switch and U-turn for the bulk of their damage, such as Zebstrika and Ninjask, as well as physically frail foes like Kadabra and Mr. Mime that would normally switch out of Dusknoir's priority moves. If a Dark- or Normal-type Pokemon is predicted to switch into Dusknoir's Shadow Sneak or Sucker Punch, Dusknoir should instead attack with its coverage options; Earthquake will OHKO Pawniard and cause substantial damage to Mightyena and Normal-types on the switch, while Ice Punch is able to 2HKO Vullaby lacking Eviolite as it enters the field. Dusknoir should avoid staying in against healthy Will-O-Wisp and Scald users, as a burn is detrimental to its offensive presence. If possible, Dusknoir should be kept alive in order to provide some insurance against late-game sweepers like Rock Polish Regice and weather-based sweepers like Stoutland and Golduck via its priority moves.
Team Options
Rotom-F is able to pressure any defensive options to Dusknoir, as its STAB-boosted Blizzard hits Tangela, Gourgeist-XL, and Vullaby super effectively, and its Electric-type moves are able to beat bulky Water-types that are able to threaten Dusknoir with Scald, such as Politoed, Lumineon, and Prinplup. In return, Dusknoir provides an immunity to Fighting-type moves for Rotom-F and threatens checks and counters to Rotom-F, like Grumpig and Probopass. Monferno is a great offensive partner because it is able to take on Dark-types like Pawniard and Mightyena for Dusknoir, while Dusknoir is able to reciprocate by beating Monferno's defensive answers; it handles Stunfisk with Earthquake, Altaria with Ice Punch, and Psychic-types like Grumpig and Kadabra with Pursuit and Shadow Sneak. Given Dusknoir's vulnerability to Will-O-Wisp, Fire-types that are immune to the move or can take advantage of it via Flash Fire, like Ninetales and Rapidash, are beneficial partners. Ninetales is able to OHKO bulky answers to Dusknoir such as Tangela and Gourgeist-XL, while Dusknoir returns the favor by beating Grumpig, Vibrava, and Altaria for Ninetales. Similarly, Pokemon with access to Facade are also good teammates for their ability to absorb Will-O-Wisp aimed at Dusknoir. Stoutland in particular is adept at taking status for Dusknoir and can break defensive walls like Vullaby that would otherwise stop Dusknoir from doing its job. Pokemon with access to Spikes, like Quilladin and Roselia, especially appreciate Dusknoir's ability to block Rapid Spin via its Ghost typing, as well as Pursuit trap Cryogonal for these Grass-types. Dusknoir is the perfect companion to leads like Weakness Policy Golem, Leavanny, and Focus Sash Rampardos for its ability to spinblock, as these types of entry hazard setters are often unable to find a second opportunity to set up Stealth Rock, or Sticky Web in Leavanny's case. Finally, Pokemon with access to Defiant are able to complete an entry hazard setting and protection core with Dusknoir by deterring Defog, so Purugly and Pawniard are ideal teammates. Additionally, both of these options resist or are immune to Ghost-type attacks aimed at Dusknoir, while in return, Dusknoir can switch into any Fighting-type moves for Purugly and Pawniard.