None. Karrablast evolves when you trade it for a Shelmet.
you need to trade a karrablast for a shelmet and the karrablast and the shelmet will evolve
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.
I had a hard time with this one... First you have to trade shelmet and youur trading partner trades Karrablast. Once the trade ends, Shelmet will evolve into Accelgor and Karrablast evolves into Excalvier.
You need to trade it with some who has a Karablast. Trade Karrablast and Shelmet and they will both evolve. Some other guy says all you have to do is trade karrablast to evolve it, so it might work with Shelmet as well. I have not tried this yet, I hope it works either way.
Shelmet
Thb
It does not evolve by levelling, it evolves when traded for a Shelmet.
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.
Trade it for a Shelmet. Both the Karrablast and Shelmet will evolve upon completion of the trade. This is the only scenario where specific Pokemon MUST be traded for either of them to evolve.
it does not evolve by a certain level it evolves by trading it with shelmet.
You trade it for a Shelmet, both will evolve when they arrive.
To get shelmet to evolve, trade it for a karrablast.