Moves
Physically defensive Skarmory is focused on setting entry hazards, walling most physical threats, and phazing the opponent. Skarmory is one of the few viable Spikes setters in the metagame. With invesment, Skarmory's defensive prowess allows it to set up Spikes easily on most Pokemon without special moves. Roost keep Skarmory healthy and negates its Flying-typing for a turn. Beware of opponents taking advantage of Roost to hit Skarmory with a super effective attack such as Swampert’s Earthquake, Breloom's Focus Punch, Machamp’s DynamicPunch, and Scizor’s Superpower, however.
One of Skarmory main advantages over other Spikes setting walls such as Forretress is its ability to phaze after setting entry hazards up. Whirlwind has two main uses: phaze out boosted sweepers such as Dragonite, Tyranitar, and Gyarados as well as spread entry hazard damage. Skarmory’s Whirlwind is one of the best ways for defensive teams to hurt the opponent, especially since most Skarmory answers such as Magnezone and Heatran are grounded. Whirlwind also assists against Substitute users, especially Breloom and Machamp if Skarmory lacks a Flying-type move. For more active damaging options, Brave Bird is an excellent move to make it a better answer to Gyarados, Gliscor, Lucario, Infernape, Breloom, and Machamp. Provided it is facing a defensive team, Brave Bird also gives Skarmory an option to pressure Clefable, forcing it to heal more often as well as finishing weakened walls dragged in by Whirlwind. Should recoil be a concern, Drill Peck is a safe alternative that doesn't wear Skarmory down, useful against foes such as Taunt Gliscor. Counter gives Skarmory a more offensive answer to boosted sweepers: as foes do not want to get phazed, physical attackers will often attack into Skarmory to weaken it for later in the game. Counter can OHKO Gyarados, Dragonite, and Tyranitar with Stealth Rock after Skarmory takes a boosted attack. As some defensive teams don’t have many Stealth Rock users, Skarmory can set up both entry hazards due to the free turns it generates. This does make Skarmory susceptible to Taunt, however.
Set Details
Physically defensive Skarmory generally should use close to maximum HP and maximum Defense EVs, as it needs all the physical defense it can get to check Dragon Dance sweepers such as Dragonite, Gyarados, and Tyranitar while also answering Breloom, Metagross, and Machamp. It is less vulnerable to Jirachi continuously flinching it with Iron Head as well. If using Counter, Skarmory should use 180 Defense EVs instead to allow it to OHKO Gyarados using +1 Waterfall with Counter after Stealth Rock, with the remaining 76 EVs in Special Defense to help it take stray special hits. Skarmory can also use more Special Defense EVs, as the base stat is quite low and can help against various mixed attackers; however, Skarmory generally needs significant investment before it can reliable take special attacks. Skarmory can run some extra Speed EVs, such as up to around 60 EVs to outspeed minimum Speed Heatran. This allows it to Whirlwind out other Skarmory first and outspeed slower Breloom before it uses Spore.
The choice between Leftovers and Shed Shell is team dependent. Leftovers is preferred, as Skarmory is forced to Roost much earlier without Leftovers and generally struggles to wall threats. For example, Metagross can KO Skarmory with Explosion much easier if Dragonite hits it hard with a +1 Fire Punch if it doesn’t heal with Leftovers. Skarmory should stick to Drill Peck instead of Brave Bird with Shed Shell to further minimize residual damage. Skarmory has to be much more careful against Clefable and Gliscor, as it still is vulnerable to Magnezone if it takes a Knock Off. Shed Shell is also useless if the opponent doesn’t have Magnezone. However, Shed Shell can invalidate Magnezone teams that rely on it to remove Skarmory. Magnezone teams often are very weak Skarmory otherwise, allowing it to excel in its role of setting up hazards and walling.
Usage Tips
Skarmory should come in liberally throughout the game to lay hazards and wall threats. Skarmory has a huge list of Pokemon it can use as setup fodder. If Skarmory lacks Shed Shell, it has to worry about potential Magnezone switches. This vulnerability can be answered by double switching to one’s own Magnezone or using Whirlwind immediately. Often, the second layer of Spikes isn’t as valuable as the first and third, so prioritize setting up Stealth Rock then one layer of Spike should Skarmory have both. Some Pokemon such as Tyranitar, Jirachi, and Swampert can have strong special coverage, so be careful about using these Pokemon as setup fodder. Being aggressive with Whirlwind is fantastic at wearing down the opposing team even with not many entry hazards set. Counter can also potentially force difficult mindgames for foes trying to break through Skarmory, so take advantage of this if you have it.
Despite Skarmory's incredible bulk, it can be overwhelmed by the threats it answers. Mastering the timing of Roost is critical; Skarmory should be keeping its health high with Roost to avoid being overwhelmed by Explosion and set up sweepers. However, opponents can take advantage Roost, as now Skarmory will be vulnerable to super effective Ground- and Fighting-type moves. Skarmory can also be overwhelmed by strong offensive Water-types such as Choice Band Swampert and boosted Gyarados, especially if Waterfall flinches, so don’t rely on it solely for this purpose. Skarmory also can be crippled by Trick, so against threats it easily walls like Metagross and Bronzong, beware of Trick + Iron Ball or Choice Band. Keeping Skarmory unstatused is often critical to beating opposing Skarmory and defensive threats such as Clefable, so avoid taking Jirachi’s Body Slam, Starmie’s Thunder Wave, and Gengar’s Will-O-Wisp for example in this case.
Team Options
Physically defensive Skarmory has many possible teammates as a staple of DPP OU. Both offensive and defensive teams greatly appreciate the extra chip damage Spikes provides and Skarmory’s defensive prowess. Tyranitar is one of the best partners, as its Choice Scarf set can Pursuit trap Starmie trying to Rapid Spin away Stealth Rock and Spikes, utility Tyranitar can set up Stealth Rock and handle Electric- and Fire-type coverage better while also covering Starmie, and Dragon Dance Tyranitar’s counters are mostly grounded, allowing it to break through opposing teams. Sand is also helpful for making residual damage stick. Skarmory also appreciates a Ghost-type such as Gengar and Rotom-A to block Rapid Spin. Gengar is excellent on more offensive teams, as it forces many switches with its power and Will-O-Wisp, while Spikes helps put defensive Tyranitar in range of Focus Blast. All Rotom-A sets assist Skarmory: Choice Scarf sets are great revenge killers, utility sets are oppressive with Spikes down, and defensive RestTalk sets spread burns and are best at blocking Rapid Spin throughout the game. Skarmory is a staple of the Magnezone bait style, which involves allowing Magnezone to trap Skarmory early in the game so that one’s own Choice Scarf Magnezone counter traps Magnezone with Hidden Power Ground. This can open up teams to another Steel-type such as defensive Jirachi or Empoleon. Skarmory can even evade being trapped with Shed Shell.
Beyond these, Skarmory generally appreciates teammates that can switch into its special weaknesses. On offensive teams, Pokemon like Choice Specs Latias, mixed Flygon, and Swampert provide Fire and Electric resistances while taking advantage of the entry hazards laid down. Flygon especially enjoys Spikes, as it heavily limits reliable switch ins except Clefable. Swampert provides Stealth Rock, and gives back up to physical sweepers trying to break through Skarmory such as Dragon Dance Tyranitar. Pokemon that take advantage of switches such as Heatran and Breloom as well as mixed threats such as Jirachi, Infernape, and Swampert love having entry hazards wear down the opponent.
For defensive teams, Skarmory is typically the primary physically defensive wall while also providing Spikes. As such, it appreciates bulkier teammates to switch into its weaknesses as well as offensive Water-types that can break it. Common choices include defensive Latias, Clefable, Milotic, Zapdos, and Tyranitar. Defensive Jirachi becomes more oppressive to face with entry hazards set while Gliscor, Nidoqueen, and Hippowdon cover Electric-types and provide their own utility. Gliscor, Zapdos, Latias, Celebi, and Nidoqueen check Breloom should Skarmory take Spore. Blissey and Clefable are strong special walls that appreciate Skarmory shoring them up against physical threats. Calm Mind Clefable especially loves Spikes to force damage on the bulky Steel-types such as Heatran and Jirachi as well as Tyranitar that wall it. Heatran and Skarmory are Steel-types that don’t share weaknesses, shoring the team against Dragon-types. As the best defensive Spikes user in the metagame, Skarmory can fit with almost all defensive teammates.