Pale Passion

The Pale Passion is a treasure found in Pikmin 2. It is actually a wrapped pale truffle. It is found in the fourth sublevel of the Submerged Castle. The treasure is found inside an Iridescent Glint Beetle that scurries around the level, making the treasure harder to obtain as Iridescent Glint Beetles move very quickly and the multiple hazards located throughout the sublevel may also become a problem.

Note that it is possible for the sublevel to not contain the an Iridescent Glint Beetle, and by extension, the Pale Passion, as detailed here and here.