He was the last of the Brawlers' Guardian Bakugan to be obtained. Julie often stands on Gorem's shoulder when he battles, which is what stopped Billy from sending Gorem to the Doom Dimension. He knew that defeating Gorem would send Julie to the Doom Dimension as well. Gorem was able to tell where all of the entrances to the worlds were in Vestroia due to there being magnetic fields.
Gorem evolved into Hammer Gorem in the middle of a battle with Clayf, one of the Legendary Soldiers of Vestroia. He has a hammer and is strangely a smidgen inverted colors, as well as now having bull-like horns and upward curved shoulders. He also gets a considerable power increase.