On which level does Kadabra evolve?

Answer 1

Kadabra evolves into Alakazam when traded. (Abra evolves into Kadabra starting at level 16).

Kadabra is #64 in the National Pokedex, and was introduced in the Generation I Pokemon titles (Red, Blue, and Yellow) where it could be found (Red and Blue Only) in Cerulean Cave, and (Yellow Only) on Route 8. In Generation VI (X and Y), Abra is obtainable on Route 5, but is a very rare encounter.

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Kadabra does not evolve based on level; you need to trade it to someone else, then it will immediately evolve into Alakazam.