The Diggers each guard various gift boxes that contain different items. All five of them claim that they are the third strongest mole before they battle Ness and friends; they even share a unique battle background with the phrase No. 3 behind their in-battle sprite.
Guardian Diggers have a relatively low amount of HP, but start battle with a power shield that they can strengthen with Shield β; the moles will also claw or tear into their targets.
They are weak against PSI Freeze and PSI Flash, and can be defeated without even triggering the power shield.