It evolves at level 30 in dragonair and again at level 55 in to dragonite
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Dratini evolves at level 30 into Dragonite.
level 30
You level it up to lvl 36.
Dratini evolves at level 30 into dragonair; then, again at 55 into Dragonite
the other answers are lies drantini evolves at level 50