Hammer Gorem 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.
Bakugan Ultimate Handbook
When Gorem evolves, its shield transforms into a huge double-sided hammer. When Hammer Gorem uses this weapon, it causes ultimate destruction. Hammer Gorem also gains a protective coat of armor and bull-like horns on its head to intimidate its foes.
Because the brawlers used the Current of Time to go back and destroy Mechtavius Destroyer before he killed him, he is now either living peacefully on New Vestroia or has reunited with Julie.
Gorem Punch: Adds 200 Gs to Hammer Gorem and subtracts 100 Gs from the opponent.
Ability Card (Bakugan Video Game)
Grand Impact: Adds 200 Gs to Hammer Gorem.
In Japan, the Subterra version in BST-04 comes with 340 Gs or 380 Gs. Pyrus versions have 670, 580, or 420 Gs. Subterra has 620, 610, 580, 480, and 400 Gs. Darkus has 600 Gs, and Haos has 530 and 400 Gs.
He sounds and looks similar to Optimus Prime from Transformers.