it does not evolve at a certain level it only evolves if you trade it with a shelmet and shelmet will evolve if you trade it with karrablast.
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you need to trade a karrablast for a shelmet and the karrablast and the shelmet will evolve
Shelmet do not evolve by level in Pokemon White. Shelmet evolve into accelgor when traded for karrablast if neither the shelmet nor the karrablast is holding an everstone.
To get shelmet to evolve, trade it for a karrablast.
Shelmet evolves only when traded for a Karrablast. Both will evolve, into Accelgor and Escavalier respectively.
You have to trade if for a karrablast