Umm... go to a pokecenter and trade it. duh.
you can trade it in the global terminal in goldenrod city, but you cannot guarantee that you will get a graveler evolving into a golem. The previous owner may have given it an everstone to hold, which would prevent the evolution.
you can also trade it at any Pokemon center, either in the union room or the wi-fi room. you will require a friend code in the wi-fi room, though.
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Graveler does not evolve by a stone (or by a level). In order for Graveler to evolve, you have to trade Graveler over to another game.
does not evolve you have to trade to make a golem geodude evolves at level 22
trade
Graveler evolves when you tade it :)
there is no specific place. level it up til level 25 and it'll evolve into graveler. if you trade graveler, it'll evolve into golem