Level it up to level 50. It will evolve into Zweileous. Level it up to 64 and you have a Hydreigon.
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deino evolves at level 50
Deino evolves into Zweilous at level 50.
you can find a Deino in the caves of Victory when you get 8 gym Badges
Deino evolves into Zweilous at level 50 which is the highest level that the first Pokemon of a 3-stage evolution evolves. Deino doesn't evolve with a stone.
Deino evolves at Level 50 and once again at Level 64.