I don't know how to evolve Gurdurr on pokemon white the video game.
You can evolve Gurdur on Pokemon White by trading it normally.
Gurrdurr is one of the tradevolution pokemon from Black/White. Simply trade him and he evolves immediately.
Http://pokemondb.net/pokedex/gurdurr
Gurdurr evolves when you (literally) trade it.
Gurdurr evolves when you trade it.
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