The Magical Stage is a treasure found only in the PAL version of Pikmin 2 (Piklopedia number 133).
Olimar's Journal
Today we found the remains of a wooden construction engine buried deep under the surface. I can't imagine anyone on this uncivilized planet inventing anything. We'll have to wait until later to finish surveying this maze, but this place intrigues me. There may be something interesting to learn about this primitive object.