Get a Graveler and trade it in any Pokemon center
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first, capture a graveler then go to the union room in any Pokemon center then trade. It evolves. And then you trade back and have a Golem. :)
The only other way to catch it is to cheat.
You have to trade a Graveler to it can evolve into a Golem. This applies for all Pokemon Games.
You have to catch the Golem.
you pee on you ds with a golem in battle and it will come out