Hydreigon is a decent role compression choice, possessing some much appreciated resistances to common offensive types, such as Ghost, Water, and Fire, while also being immune to Psychic and Ground. In a pinch, it can provide the utility of both Yveltal and Eternatus while also checking Groudon. Hydreigon differentiates itself from offensive Eternatus with Nasty Plot, making it a terrifying attacker with very few defensive answers. Sadly, Hydreigon can never be a team's only answer to the threats it checks because of its middling bulk, leading to it stacking weaknesses on teams and competing heavily with Eternatus, which is much more defensively stable. Additionally, Hydreigon is very reliant on Nasty Plot to effectively wallbreak, and it struggles to safely set up because of its poor bulk, its mediocre Speed, and the recoil damage from Life Orb, making it easy to revenge kill too. Lastly, because Draco Meteor harshly drops Hydreigon's Special Attack, Hydreigon cannot repeatedly use its strongest attack and must rely on its teammates to clean up.
name: Life Orb
move 1: Nasty Plot
move 2: Draco Meteor
move 3: Dark Pulse
move 4: Flash Cannon / Roost
item: Life Orb
evs: 252 SpA / 4 SpD / Spe
Nasty Plot enables Hydreigon to muscle through the generally bulky Ubers metagame. Draco Meteor OHKOes bulky Kyogre, Yveltal, and Zarude after a boost. Dark Pulse hits Necrozma-DM and Calyrex-S while also providing the potential to OHKO Groudon at +2. Flash Cannon allows Hydreigon to hit Xerneas and Tyranitar for super effective damage, two Pokemon that otherwise can switch into its STAB combination. Roost is an option on the final moveslot to better check Calyrex-S and mitigate Life Orb recoil, but it turns Hydreigon into a momentum sink due to its reliance on the move.
Because of its middling bulk but high damage output, Hydreigon fits best on hyper offense teams where it can help mitigate the Choice Scarf Calyrex-S weakness these teams have. Shuckle and Slurpuff can set up Sticky Web for Hydreigon, making it much harder to revenge kill and providing more setup opportunities. Offensive Yveltal should double up with Hydreigon to better take on Calyrex-S while overwhelming their shared checks in Eternatus, Tyranitar, and Xerneas. Other strong wallbreakers that blow through the opponent's special walls are appreciated. Examples of those include Marshadow and Mewtwo, both of which can effectively deal with Yveltal and Blissey. Dragon Dance Necrozma-DM can bait in and heavily damage Yveltal and check Eternatus for Hydreigon while also dealing with defensive Xerneas. In exchange, Hydreigon dissuades Calyrex-S from attempting to revenge kill Necrozma-DM while also keeping Kyogre in check.
Dragon Pulse gives Hydreigon more chances to use its Dragon-type attacks but is considerably weaker, especially without a boost. Fire Blast lets Hydreigon OHKO Ferrothorn and Zamazenta-C but provides little coverage otherwise. 52 Special Defense EVs allow Hydreigon to survive two Astral Barrages from Choice Scarf Calyrex-S after Stealth Rock.
Checks and Counters
**Revenge Killers**: Marshadow, Eternatus, Choice Scarf Kyogre, and Galarian Darmanitan outspeed and threaten to OHKO Hydreigon. None of them can safely switch into it, though.
**Fairy-types and Fairy-type Coverage**: Xerneas resists both of Hydreigon's STAB moves and can revenge kill it if it's not boosted, while Clefable can even sometimes tank a boosted Flash Cannon. Focus Sash Calyrex-S can also OHKO it with Draining Kiss.
**Zamazenta-C**: Zamazenta-C can take Hydreigon's boosted hits and retaliate with Close Combat.
**Ho-Oh**: Ho-Oh can tank a boosted Draco Meteor from Hydreigon and cripple it with Thunder Wave.
**Status**: Toxic poison will quickly wear down Hydreigon in conjunction with Life Orb recoil, while Thunder Wave completely incapacitates it.
**Tyranitar**: Tyranitar can stomach any of Hydreigon's hits and cripple it with a status move.
- Written by: [[Lasen, 273339]]
- Quality checked by: [[Aberforth, 249382], [Fc, 511624]]
- Grammar checked by: [[Rabia, 336073], [DC, 449990]]