These Yellow Bulborbs are specially mechanized for the popular Pikmin Adventure attraction, based off the expeditions to PNF-404. These in particular were based off the extinct Grub-Dog species, the Yellow Bulborb.
Yellow Bulborbs are, physically, just Mecha Red Bulborbs but with a yellow coat, but as behavior goes they are drastically stronger.
Unlike true Bulborbs, these mechs are able to shoot out orbs of water at its targets, making them helpless until they are freed from the orb. They can also charge exceptionally fast, but hardly able to turn while charging so this attack can be easy to dodge.