From Pikipedia, the Pikmin wiki
The Confection Hoop (おかしの大車輪?, lit.: "Large Sweet Hoop") is a treasure found in Pikmin 2. The Confection Hoop is a section of an unfrosted baumkuchen cake. It is found at the end of a long, narrow, passage on the second sublevel of the Submerged Castle. It can only be reached by traveling through a small pipe that leads to the unreachable, high area. One or more Dwarf Orange Bulborbs may be found near it. When transporting it back to the pod, Fiery Dweevils, Careening Dirigibugs, and other enemies may attack the Pikmin transporting it.
“The hole we searched today was filled with a saccharine scent. Just sniffing it put me at risk of developing a cavity. Ugh... I don't think I can eat anything sweet for a while. Wait... Who am I kidding?”
“This sugary delight has even a machine like me wishing to partake in its deliciousness! What a sweet-looking circlet!”
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