This guide details how to obtain and utilize Hydreigon, a powerful Dark/Dragon-type Pokémon in Pokémon Scarlet & Violet. Hydreigon's pre-evolutions, Deino and Zweilous, are exclusive to Pokémon Scarlet, requiring trading or transferring to obtain them in Pokémon Violet.

Acquiring Deino and Zweilous:

• Pokémon Scarlet: Find Deino in Alfornada Cavern, Dalizapa Passage, Glaseado Mountain, Area Zero, and North Province (Area Two). Higher-level Deino (35-40) reside in Alfornada Cavern and Dalizapa Passage. Zweilous can also be found in these locations, as well as in 4-star Tera Raids (requiring 3 gym badges). Deino also appears in 3-star Tera Raids.
• Pokémon Violet: Since Deino is Scarlet-exclusive, utilize Pokémon HOME to transfer from another compatible game (Sword/Shield, GO, or Scarlet) or trade via the Union Circle (requires Nintendo Switch Online). Transferring via HOME involves moving Deino to your HOME Basic Box, then to your Violet PC Box.

Evolution:

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

Hydreigon's Strengths and Weaknesses:

Hydreigon, a pseudo-legendary Pokémon, boasts a base stat total of 600, excelling in Special Attack and Attack with decent Speed. A Timid or Jolly nature is recommended.

Type Effectiveness:

• Super Effective Against: Dragon, Ghost, Psychic
• Weaknesses: Fairy (4x), Fighting, Bug, Dragon, Ice
• Resistances: Grass, Water, Fire, Electric, Ghost, Dark
• Immunities: Ground, Psychic

Hydreigon's 4x weakness to Fairy-type moves can be mitigated through Terastallizing. Its movepool allows for both physical and special attacking strategies. Consider moves like Flash Cannon (Steel-type TM), Nasty Plot, Dragon Pulse (or Draco Meteor), and Dark Pulse. The Steel-type coverage is crucial to offset its Fairy weakness. Hydreigon can be caught in 5/6-star Tera Raids.