Quavershell

The Quavershell is the final hurdle faced in the Ashen Arboretum and lurks at the very top of the tree. Its sticky feet allow it to effortlessly walk on the walls surrounding the arena, and tough armor covers the top of its head, preventing Pikmin from attacking it there. As the Quavershell walks, it spews out fireballs from the sucker on its head, which bounce around the arena and generally make things tougher for non-Red Pikmin.

To damage the Quavershell, it must first be loosened from the wall by having Pikmin attack its feet, causing it to fall off and rage for a bit, stomping around the floor and causing fireballs to rain down sometimes; it is during this time that the Quavershell's soft body can be attacked more easily, though it will occasionally stop rampaging to devour any Pikmin directly underneath its snout. Eventually the creature will return to the safety of the walls and calm down, so take advantage of its tantrum while it lasts.