Moves
Offensive Calm Mind Suicune is one of the most dangerous Calm Mind users in the metagame, taking advantage of its bulk to set up on Pokemon such as Heatran and Gliscor.
Hydro Pump is threatening even with no boosts, OHKOing Heatran without bulk investment after Stealth Rock. It additionally OHKOes Lucario with a Special Defense drop, 2HKOes most Metagross, and 2HKOes most Tyranitar without a Passho Berry. Ice Beam gives Suicune coverage against many Grass- and Dragon-types that threaten it, including Breloom, Latias, Roserade, and Dragonite, while also giving a super effective option against Zapdos. Finally, Hidden Power Electric threatens other Water-types, notably OHKOing bulkless Gyarados 75% of the time after Stealth Rock, combating opposing Suicune and eventually beating Haze Milotic through PP stalling.
After using Calm Mind, Suicune becomes even more threatening and able to seriously damage most of its answers. Frail offensive checks such as bulkless Rotom-A and most Breloom can no longer take Hydro Pump and Ice Beam. Common answers to Water-types such as Kingdra, defensive Latias, and Empoleon can be 2HKOed by Ice Beam and Hidden Power Electric. Additionally, do not underestimate Suicune’s ability to tank hits at +1—only Modest Choice Specs Zapdos can guarantee an OHKO on +1 Suicune after Stealth Rock. This allows Suicune to, in an emergency, take a strong hit, such as Roserade’s Leaf Storm, Celebi’s Leaf Storm, or Choice Specs Latias’s Draco Meteor, and come out on top. Another option over Hidden Power Electric is Protect, as a common answer to Suicune is an Explosion from Passho Berry Heatran, Bronzong, or Metagross—especially helpful in the lead slot to block Explosion. In addition, Protect drains foes' PP, gives additional Leftovers recovery, and scouts moves such as Trick and Encore. However, missing coverage on Water-types like Gyarados, Milotic, Empoleon, and Starmie is a big loss.
Set Details
Suicune should be running a Timid nature most of the time. Suicune sits at a very valuable Speed tier, and typically needs to invest fully or nearly fully in Speed to outspeed Heatran, Adamant Lucario, and Mamoswine. Additionally, Timid Suicune’s Speed outpaces defensive variants of Jirachi, Celebi, Roserade, Zapdos and Latias. However, as a lesser option, Modest allows Suicune some notable power benchmarks, such as a chance to 2HKO Clefable and specially defensive Jirachi after Stealth Rock at +1. Suicune can also sacrifice Speed and Special Attack to run more bulk, as, without Stealth Rock, it is normally very close to getting OHKOed by +1 Dragonite's Outrage and 2HKOed by +1 Gyarados. An example spread is 48 HP / 52 Def / 180 SpA / 228 Spe with a Modest nature, which maximizes Leftovers recovery, survives +1 non Life Orb Dragonite after Stealth Rock and one round of Leftovers, and outspeeds Jolly Breloom, Adamant Gyarados, and Adamant Dragonite.
Suicune can be even more offensive and forgo Leftovers for Lum Berry. Lum Berry grants Suicune an enormous advantage against defensive teams, as a common way to neutralize it is to paralyze it and slowly wear it down with Clefable. To paralyze at +1 Suicune, Latias or Clefable typically will sacrifice themselves to pull off Thunder Wave, potentially opening defensive teams to other threats.
Usage Tips
While offensive Calm Mind Suicune can sweep, it typically plays as an offensive team’s primary switch-in to Heatran, answers Gyarados and Dragonite in emergencies, trades with threats such as Metagross, Swampert, and Infernape, and sets up early-game before sand is up to weaken answers to Water-types such as Latias and Roserade. Especially if it has a Lum Berry or is leading, Suicune should be very aggressive with its health to open up holes in the opposing team.
Suicune should be ready to use Calm Mind immediately if the opposing Pokemon can’t threaten it effectively, as even its checks can struggle against it if boosted. Suicune really appreciates teammates weakening or eliminating Water switch-ins, offensive Electric-types, and special walls such as Roserade, Shaymin, Zapdos, and Clefable. Suicune also enjoys a field clear of sand to use its natural bulk and power at +1 to push past its checks. Try to avoid getting Suicune statused, as it becomes much worse against Breloom and defensive Roserade if paralyzed, for example. Trick from Rotom-A or Latias can cripple Suicune; however, if Hydro Pump answers are gone, Suicune can sweep at +1 despite being Choice-locked. If Suicune has Protect, aggressively predicting Explosion, such as right after switching it in on non-Leftovers Heatran, can often pay dividends against opponents desperate to remove it.
Team Options
Suicune really shines on bulky offensive Fire / Water / Grass cores, where it complements Pokemon like Heatran and Roserade. Heatran can set up Stealth Rock and generally threatens the Grass-types that scare out Suicune, such as Roserade and Celebi. Bulkier Heatran sets also assist against defensive Jirachi, which can tank boosted Suicune hits and paralyze it with Body Slam. Roserade especially assists Suicune by removing Toxic Spikes, a giant thorn in its side. Roserade can also set up Spikes and Toxic Spikes, which helps wear down Celebi, Milotic, Blissey, and even Vaporeon. Suicune also appreciates a strong offensive Water-type alongside it, such as Empoleon, Kingdra, Choice Specs Starmie, or Swampert, so both can synergistically weaken Water-type checks. Teammates like Gengar and the aforementioned Heatran can cripple or remove defensive checks such as Clefable, Blissey, and Latias with Explosion, while Heatran can further lure Water-types such as Starmie and Milotic with a Passho Berry + Explosion set. Trick users like Choice Scarf Rotom-A and Choice item Latias are another way to hinder special walls. Breloom is a great Suicune partner, as it absorbs status and Knock Off once its Toxic Orb has activated and counters special walls. Suicune appreciates a Ground-type or Tyranitar—but remember that sand weakens it—to absorb strong Electric-type attacks from the likes of Zapdos and Rotom-A. Effective Ground-types include Swampert, Nidoqueen to set up and absorb Toxic Spikes, Gliscor, and Choice Scarf Flygon. Suicune also appreciates Magnezone support, as bulky Steel-types such as Jirachi, Metagross, Bronzong, and Skarmory can cripple Suicune with status, tank a hit and use Explosion on it or phaze it.
Offensive Suicune can fit on a variety of other archetypes too. Hyper offense teams, such as those built around dual screens provided by Uxie, Azelf, or Cresselia, enjoy its strong power at +1 as well as its ability to plug many defensive holes these teams typically have. Very aggressive special offensive teams built around Infernape, Choice Specs Latias, and Rotom-A appreciate Lum Berry Suicune's ability to power through defensive Pokemon. Other Pokemon that can fit on these aggressive teams are Dragon Dance Tyranitar to help break through shared checks like Milotic, Dragon Dance Gyarados to form a strong Water-type offensive core, Life Orb Swords Dance Scizor to eliminate Skarmory, and Dragon Dance Dragonite. Suicune can also fit on rain teams alongside other Water-types such as Empoleon, and generally it works well on offensive teams that want some added security against Dragon Dance users and Heatran.