Nuzleaf doesn't evolve in a certain level, you have to use a Leaf Stone on it and then it evolves into Shiftry.
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Nuzleaf only evolves by use of a Leaf Stone, so it can evolve at any level.
You need a leaf stone :)
around level 43 :)
Seedot will evolve into Nuzleaf at level 14, then into a Shiftry once you use a Leaf Stone on the Nuzleaf.
Ponyta evolves at Level 40 in Pokemon diamond.