This hammer-wielding robot works for Grimlord. He is referred to as unbeatable, and destroys Zelton's The "Invincible" Blade to prove the strength of Decimator's army. Hammerbot is defeated, but not destroyed, when Ryan breaks off his helmet. Ryan almost destroys him with his own hammer while Hammerbot is defenseless, but decides to spare his life since the VR Troopers fight fair. Hammerbot fits the category of Decimator's army.
NOTE: In Metalder, Hammerbot (or BenK) leaves the Empire after losing his battle. He is later shown saving a captive family, which costs him his life when the Mutant Skugs (or Shadow Light Fighters) attack and destroy him.