Description
Front and back sprites for two unnamed Pokemon were found in a 1998 archive for Gold & Silver. Fan art recreations are included. They appear to be in the same family, looking at the moth's chest and considering their numbers. It's possible they went on to inspire the Pineco bagworm family. Though, taking its moth evolution into account, and thinking the bagworm looks a little more like Burmy, I have included them here.
Wormadam had front and back sprites in the 2006 march-august source leak for Diamond and Pearl, appearing slightly different. Burmy can be naked, as shown on the official Japanese Pokemon website in 2017.