[OVERVIEW]
Hydreigon is a good wallbreaker in OU thanks to its great Special Attack combined with a decent dual STAB combination and wide range of coverage options, making it difficult for some teams to switch into. Its typing plus decent overall bulk allows it to switch into various defensive Pokemon such as Slowbro, Rotom-W, and Mega Venusaur, making it a terror against more balance-inclined teams. A good ability in Levitate also gives it an immunity to all entry hazards bar Stealth Rock and grants it even more opportunities to switch in. However, Hydreigon sits at an awkward Speed tier, putting it behind numerous offensive Pokemon such as Mega Gardevoir, Mega Diancie, Weavile, and Keldeo. It also struggles to break past certain Fairy-types such as Clefable, Azumarill, and Mega Altaria, causing it to be setup bait at times. Hydreigon faces stiff competition from Hoopa-U as well, which sports better coverage and more formidable offenses, though Hydreigon manages to set itself apart with not being vulnerable to Pursuit, as well as having reliable recovery in Roost.
[SET]
name: Life Orb
move 1: Draco Meteor
move 2: Flash Cannon
move 3: Dark Pulse / Roost
move 4: Fire Blast
item: Life Orb
ability: Levitate
nature: Modest
evs: 4 HP / 252 SpA / 252 Spe
[SET COMMENTS]
Moves
========
Draco Meteor is Hydreigon's most powerful attack and deals very good damage to most neutral targets. Flash Cannon is necessary coverage that targets Fairy-types such as Clefable, Mega Gardevoir, and Mega Diancie, which otherwise have little issue switching into Hydreigon's STAB combination. Dark Pulse is a reliable secondary STAB attack that has great neutral coverage with Draco Meteor, hitting Steel-types such as Heatran, Skarmory, Jirachi, and Mega Metagross, as well as Psychic-types such as Mew, Slowbro, and Celebi. Roost is an alternative that lets Hydreigon restore lost HP from Life Orb recoil and some resisted attacks and works well with Hydreigon's ability to force switches. Fire Blast rounds out Hydreigon's coverage, hitting Pokemon such as Mega Scizor, Klefki, Ferrothorn, and Bisharp. Flamethrower is another option that trades power for reliability, only missing out on the guaranteed 2HKO against specially defensive Skarmory and OHKO on Mega Heracross. Earth Power can be used over Fire Blast to hit Heatran much harder and 2HKO Azumarill while retaining coverage against Bisharp and non-Magnet Rise Klefki. Superpower is an option that allows Hydreigon to hit Tyranitar and specially defensive Heatran in the same slot.
Set Details
========
Maximum Special Attack EVs plus a Modest nature allow Hydreigon to hit as hard as possible, while maximum Speed EVs allow Hydreigon to outspeed neutral-natured Kyurem-B and below. Life Orb is used to give Hydreigon a good power boost to all of its moves while letting it switch between them, taking full advantage of its wide coverage.
Usage Tips
========
Hydreigon should generally be brought in early- to mid-game to break down the opponent's bulkier Pokemon. Due to its resistances, it can be brought in on some Pokemon such as Slowbro, Rotom-W, defensive Starmie, and Bisharp. Levitate can also net additional opportunities to switch in, such as against the likes of Hippowdon and Gliscor. Once brought in, use either Draco Meteor or Dark Pulse to get a heavy hit against the opponent's team. However, when matched up against a Fairy-type such as Clefable, Mega Altaria, or Azumarill, be reluctant in using Draco Meteor, as the drop in Special Attack leaves Hydreigon as setup bait for all of them. For Azumarill and Mega Altaria, it's particularly dangerous, as they could be able to set up Belly Drum or Dragon Dance, respectively. Roost should be used against Pokemon that cannot do much in return or on forced switches to recover lost HP from Life Orb recoil or repeated chip damage. Just note that Roost sacrifices offensive momentum, so only use it when necessary.
Team Options
========
Mega Metagross is a great teammate, as it's able to force out Fairy-types that give Hydreigon issues, as well as Pursuit trap Latios and Latias, while Hydreigon is able to break down foes such as Slowbro, Skarmory, and Rotom-W for Mega Metagross. Similarly, Assault Vest Metagross acts a more consistent switch-in to Fairy- and Psychic-types thanks to its increased special bulk, allowing it to easily Pursuit trap faster Pokemon such as Latios and Mega Alakazam. Other Steel-types such as Klefki and Ferrothorn are also effective in checking certain Fairy-types, with both providing Spikes and Thunder Wave support. Checks to Fighting-types, particularly Keldeo, are recommended. Mega Scizor also performs well, as it can switch in on most Fairy-types safely and either use them to set up or revenge kill them with Bullet Punch, while in return, Hydreigon breaks down answers to Scizor such as Skarmory and Rotom-W. On more offensively inclined teams, Serperior and Raikou fit well, as Hydreigon is able to handle problematic Pokemon for them, such as Mega Venusaur and Heatran. On a more balance-oriented team, Mega Venusaur and Amoongus make for fine teammates, as both are able to handle Keldeo and Azumarill, while Mega Venusaur can take on Mega Lopunny. Clefable is a soft check to Pokemon such as Mega Lopunny, Keldeo, and Weavile and can paralyze faster foes with Thunder Wave, letting Hydreigon have an easier time against faster teams.
Stallbreakers such as Mega Gardevoir and Mew pair decently with Hydreigon, as the former can break past bulkier foes such as Clefable and Mega Altaria, while the latter is a more defensive approach, wearing down and crippling foes such as Chansey and specially defensive Skarmory with the combination of Taunt and Will-O-Wisp, as well as burning some problematic physical attackers such as Azumarill and Mega Lopunny. Keldeo is a decent partner, as it appreciates Hydreigon's ability to break down answers to it such as Slowbro, Celebi, and Amoonguss. Due to Hydreigon's lacking Speed, it tends to struggle against fast offensive teams. Pokemon such as Mega Lopunny and Talonflame make for great partners, as both appreciate Hydreigon's ability to break down bulkier Pokemon that may cause issues for them , such as Slowbro, Rotom-W, Hippowdon, bulky Garchomp, and Landorus-T, while both are able to take down faster threats such as Keldeo, Latios, and Weavile.
[SET]
name: Choice Scarf
move 1: Draco Meteor
move 2: Dark Pulse
move 3: Earth Power / Fire Blast
move 4: U-turn
item: Choice Scarf
ability: Levitate
nature: Timid / Modest
evs: 4 HP / 252 SpA / 252 Spe
[SET COMMENTS]
Moves
========
Draco Meteor is Hydreigon's most powerful STAB attack, dealing good damage to all nonresistant Pokemon. Dark Pulse is a more consistent STAB move that also gets coverage on Psychic-, Ghost-, and Steel-types such as Slowbro, Gengar, Jirachi, and Mega Metagross. Earth Power lets Hydreigon revenge kill Mega Diancie, as well as hit Bisharp, Klefki, Tyranitar, and Heatran. Fire Blast is an alternative to hit foes such as Mega Scizor and Ferrothorn while still being able to hit Bisharp and Klefki. U-turn is great for keeping up offensive momentum and prevents Fairy-types such as Azumarill, Clefable, and Mega Altaria from getting free switches in.
Set Details
========
The given EV spread maximizes both Special Attack and Speed to ensure Hydreigon acts as an effective revenge killer. A Timid nature is used to allow Hydreigon to outspeed Choice Scarf Landorus-T and Kyurem-B as well as +1 Adamant Mega Charizard X. Modest is an alternative if more power is desired and revenge killing the aforementioned Pokemon is not necessary. Choice Scarf is used to let Hydreigon act as a revenge killer for certain Pokemon, as well as let it outspeed Pokemon it cannot normally, such as Latios, Weavile, and Mega Lopunny.
Usage Tips
========
Early-game it's generally best to use U-turn to scout for the foe's move and to keep up offensive momentum. This is especially important if the opposing team has a Fairy-type, as they can easily switch into Hydreigon locked into either of its STAB moves. Once brought in, Hydreigon should generally use the appropriate coverage move to revenge kill the foe. Draco Meteor should be used cautiously, as it can give many Pokemon an opportunity to freely set up and sweep or lay down entry hazards. Once Dark-resistant Pokemon are weakened or eliminated, use Dark Pulse to clean late-game. Despite being played primarily as a revenge killer, Hydreigon can also take advantage of its resistances to switch into Pokemon such as Slowbro, Celebi, and Rotom-W; however, it must watch out for Thunder Wave against all of them, as it leaves Hydreigon heavily crippled for the rest of the match.
Team Options
========
Mega Scizor makes for a decent teammate, as it's able to switch in on many prominent threats to Hydreigon, such as Weavile, Klefki, Mega Altaria, and Clefable, and take them down with Bullet Punch or use them as setup bait. Mega Scizor and Hydreigon are both able to keep up offensive momentum with U-turn. Mega Manectric and Raikou threaten Pokemon such as Azumarill and Keldeo and can keep up offensive momentum with Volt Switch; Mega Manectric's Intimidate also allows Hydreigon to switch into some physical attacks more comfortably. Choice Band Azumarill breaks down specially bulky Pokemon such as Clefable and Chansey while also revenge killing Sand Rush Excadrill, which otherwise outspeeds and KOes Hydreigon with Life Orb-boosted Iron Head after some prior damage. Hydreigon acts a good revenge killer to fast foes such as Mega Alakazam, Latios, and Mega Manectric, so Keldeo makes for a decent partner because it's threatened by the aforementioned Pokemon. Hydreigon is also able to break down more defensive answers to Keldeo such as Slowbro and Celebi.
[STRATEGY COMMENTS]
Other Options
=============
Taunt lets Hydreigon prevent defensive Pokemon from restoring any lost HP with recovery moves, prevent entry hazards from being set up, and block status moves, making Hydreigon a nightmare for much more passive teams. Thunder Wave can be used to catch faster Pokemon such as Keldeo and Mega Lopunny on the switch, allowing Hydreigon to take them down on the following turn. Tailwind can alleviate its Speed issues somewhat, but the number of turns it lasts is quite limited, making it undesirable in most cases. Choice Specs may sound appealing at first for the amount of power it provides, but it is generally not recommended because Hydreigon prefers to be able to switch its moves, as it's otherwise left as setup bait for numerous Pokemon if locked into either of its STAB moves; also, unlike Choice Scarf, it doesn't improve its matchup against offensive teams.
Checks and Counters
===================
**Fairy-types**: Fairy-types such as Azumarill, Clefable, Klefki, Mega Altaria, and Mega Diancie are immune to Draco Meteor and resist Dark Pulse, making them consistent checks to Hydreigon. Azumarill, Clefable, and Mega Altaria are particularly dangerous, as all of them can take advantage of Hydreigon locked into either of its STAB moves or at -2 from Draco Meteor by setting up and do not take very much damage from Flash Cannon. Klefki can switch into all of Hydreigon's moves except for Fire Blast and Earth Power and can cripple Hydreigon with Thunder Wave, hit it with Dazzling Gleam, or use it to set up layers of Spikes. Mega Diancie and Mega Gardevoir are able to switch into most of Hydreigon's attacks, naturally outspeed it, and OHKO it with their respective STAB moves.
**Faster Attackers**: Due to Hydreigon's lacking Speed, it's left vulnerable to many faster Pokemon such as Keldeo, Weavile, Mega Lopunny, and Latios. However, all of these Pokemon cannot safely switch in due to Hydreigon's wide coverage, and it can also somewhat circumvent this issue with a Choice Scarf. Weather sweepers such as Kingdra and Kabutops also get a mention, as under the effect of Swift Swim, they outspeed even Choice Scarf variants of Hydreigon.
**Fighting-types**: Fighting-types such as Keldeo, Terrakion, and Mega Lopunny naturally outspeed Hydreigon and OHKO it with their respective STAB moves. Breloom cannot switch into Hydreigon, but it can pick it off with Mach Punch. Conkeldurr when equipped with an Assault Vest can switch into Hydreigon's attacks relatively well and hit back with Drain Punch or finish it off with Mach Punch.
**Priority**: Hydreigon's typing leaves it vulnerable to various forms of priority such as Mach Punch from Breloom or Ice Shard from Weavile or Mamoswine, allowing all of these Pokemon to revenge kill Hydreigon regardless of whether it's using a Choice Scarf or not. Talonflame also gets a mention, as Brave Bird deals significant damage and specially defensive variants can switch into some of Hydreigon's moves.
**Specially Bulky Pokemon**: Chansey has little issue switching into any of Hydreigon's moves and can cripple it with Thunder Wave or chip away at its HP with Seismic Toss. Other specially bulky Pokemon such as Hoopa-U and Assault Vest Azumarill can take a hit from Hydreigon and KO back with Drain Punch and Play Rough, respectively. Assault Vest Tornadus-T safely switches into Draco Meteor from full health and deals heavy damage with either Hurricane or Superpower, steal momentum from Hydreigon with U-turn, or Knock Off its Life Orb, making it much easier to manage.
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