From Pikipedia, the Pikmin wiki
The Possessed Squash (オオモノノケカボチャ?, lit.: "Big Ghost Pumpkin") is a treasure in Pikmin 2. It is a jack-o-lantern, and can be found on the eighth sublevel of the Dream Den. Collecting this treasure is time-consuming, as there are an Antenna Beetle, many Dweevils and a few hazards on this floor. The Possessed Squash can be found in one of the dead ends of the sublevel, often carried on the back of a Dweevil. If that happens, the pumpkin may become stuck in the corner of a wall if you attack the Dweevil.
“All of the plants in this region have interesting characteristics. Like this freakish one, for example. Lately, I've started the habit of tasting new discoveries. It may be dangerous to eat unfamiliar plants, but I've only gotten violently sick a few times.”
“This mutated gourd of titanic proportions is filled with bad seeds. A score if you adore revulsion!”
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