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X-ian Hydreigon
Steel/Dragon
The middle head and wings are covered in metal, along with a chunk of its torso and legs.
Legends say that the X-ian Hydreigon gained its Steel typing to compete with the other powerful Pokemon in the region, and that the first Hydreigon to get this form was saved by a family of Meltan after losing its head and wings in a fight with an incredibly powerful Tyranitar.