Tagg's Hydreigon was among the last members of Tagg's Unova team. Hydreigon and Tagg first met at Unova's Victory Road right before the climax of the Unova arc, where she attempted to take a bite out of his leg as a Deino. Taking pity on her upon discovering her emaciation, Tagg took her as his own, and got her undying loyalty as a result.
Hydreigon is a good mon at heart, even though she has a nasty temper and lacks tact when it comes to eating. She also had problems comprehending friendship since her world consisted only of "food" and "predators", leading a lot of the other Pokémon to be afraid of her for a while. Despite her simple outlook at times Hydreigon is not stupid and also happens to be a good mother to her brood.
- Birthday: June 1, 2008
- Age: 9
- Met: Old!Unova Victory Road (Deino)
- Ability: Levitate
- Ball: Ultra
Among the most powerful of Tagg's mons, her battling style involves tearing her opponents apart (Sometimes literally) with raw power. She can also use her three heads to fire Flamethrowers and Dragon Pulses at once outside of official battles, and can stab opponents with her tail.
- Bite, Crunch, Dark Pulse, Taunt, Torment
- Draco Meteor, Dragon Rush, Dragon Pulse, Outrage
- Fire Blast, Flamethrower
- Hyper Voice, Protect, Round
In the AU
In the AU Hydreigon was never caught by Tagg, and ended up joining the rebellion against Scolemis. She got her memories back upon meeting Nadia at DST.
- Hydreigon and Nadia don't get along due to the former breaking the latter's wings with an Outrage, though these days it's one-sided on Nadia's part. Ironically despite their past history the two resemble eachother the most in terms of personality.
- Hydreigon had a one night stand with Alduin's brother Vaalgav which resulted in a clutch, including Baigan.
- Most of the team used to fear Hydreigon, but now her antics are often met with shaking heads.
- Hydreigon gets along best with Draca and Garchomp teammate-wise.
- Hydreigon has entered an eating rivalry of sorts with Sue due to Dream World correspondence.
- Helped Tagg defeat Nino and Nina when he fought Giovanni.
- Helped Tagg defeat Luke by finishing off Lake and defeating Woolly.
- Killed Clover by ripping his throat out.
- Helped defeat Scolipede's Hydreigon by using a double Draco Meteor in tandem with Draca