It evolves in Hydreigon at level 64. It resembles a 3 headed hydra with 3 pairs of wings.
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Zweilous evolves at level 64
zweilous evolves into hydreigon at level 64.
No stones makes Zweilous evolve. It is really anoying, but you wil have to train it to level 64 if you want a Hydreigon. Zweilous is the Pokemon who needs moost training of all to evolve.
Train it to level 54 and it will evolve into Zweilous
Level it up to level 50, then it will evolve into Zweilous. Level it up to level 64, to evolve it into Hydreigon.