This guide details how to obtain and utilize the powerful Dark/Dragon-type Pokémon Hydreigon in Pokémon Scarlet and Violet. Hydreigon, a pseudo-legendary Pokémon, boasts impressive stats and is a valuable asset to any team. However, its evolutionary line (Deino and Zweilous) is exclusive to Pokémon Scarlet.

Acquiring Deino:

Deino and its evolution, Zweilous, are found in various locations within Pokémon Scarlet:

• Alfornada Cavern: Located southwest Paldea; requires Koraidon's high jump ability.
• Dalizapa Passage: Situated between Medali and Zapapico.
• Glaseado Mountain: A readily accessible mountain area.
• Area Zero: A late-game area.
• North Province (Area Two): Another accessible area.

Deino and Zweilous also appear in 3-star and 4-star Tera Raids, respectively, offering a chance for a Pokémon with a Hidden Ability. Hydreigon can be found in 5 and 6-star Tera Raids.

Obtaining Deino in Pokémon Violet:

Since Deino is Scarlet-exclusive, obtaining it in Violet requires trading or transferring via Pokémon HOME. The Nintendo Switch Online membership is needed for Union Circle trading; otherwise, Pokémon HOME allows transfers from Pokémon Sword/Shield, Pokémon GO, and Pokémon Scarlet.

1. Move Deino to your Basic Box in Pokémon HOME.
2. Open Pokémon Violet in HOME and transfer Deino to a PC Box.

Evolution:

Deino evolves into Zweilous at level 50, and Zweilous evolves into Hydreigon at level 64. Utilize auto-battling or Exp. Candies (especially L and XL) to expedite the process.

Hydreigon's Strengths and Weaknesses:

Hydreigon's base stat total is 600, with high Special Attack and Attack, and good Speed. A Timid or Jolly Nature is recommended.

• Strengths: High offensive stats, versatile movepool.
• Weaknesses: 4x weakness to Fairy-type moves, also weak to Fighting, Bug, Dragon, and Ice.
• Resistances: Grass, Water, Fire, Electric, Ghost, Dark.
• Immunities: Ground, Psychic.

Terastallizing mitigates the 4x Fairy weakness. Consider using Flash Cannon (Steel-type TM) to counter Fairy types. Other recommended moves include Nasty Plot, Dragon Pulse (or Draco Meteor), and Dark Pulse.

Hydreigon's impressive stats and movepool make it a formidable Pokémon, despite its vulnerabilities. Strategic move selection and Terastallizing are key to maximizing its potential.