Flatbert

A flatbert is a harmless cardboard cutout resembling an enemy.

In Pikmin 2... Again?
Flatbert is a flattenid in Pikmin 2... Again?, first seen at the Welcome Forest, where three Red Pikmin are attacking it. Past that, the Flatbert becomes a recurring enemy, used as a way to fool leaders and Pikmin into thinking it's a real threat. Flatberts are cardboard cutouts in the shape of a rotund, Biper-like creature drawn with black marker, and upon defeated they'll shatter. Despite not being alive, it is humorously considered an enemy, albeit a harmless and stationary one.