In Pokémon Black 2, Dragonair will evolve into Dragonite at Level 55.
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Dragonair evolves at Level 55 in Pokémon FireRed.
Level 55.
Level 55
Buy a Dratini from the Game Corner's Prizes, then get it to level 30, when it will evolve into Dragonair. Get your new Dragonair to level 50 and it will evolve into Dragonite.
Dratini evolves to dragonair at level 30 dragonair evolves into dragonite at level 55.