Time Capsule

The Time Capsule is a treasure in Pikmin 2 that is actually a golden locket with a picture of a Shetland Sheepdog. In Japan, the picture is that of a house cat. It is found on 4th sublevel of the Citadel of Spiders.

Captain Olimar's Journal
"This must be some kind of a memorial capsule left by a lost civilization. It has left behind some image data, but I can't make any sense of it. I'm going to have to do some additional analysis. I'll document any exciting new developments in my log, along with pages and pages of meaningless doodles."

Sales Pitch
"This shiny pod was found buried like a time capsule, holding image data of unknown origin. Is it possible that you fathom the data's import? This riddle will entrance all puzzle lovers!"

Trivia

 * In the Japanese version of Pikmin 2, the picture inside the locket is a cat instead of a dog. This is because at the time, cats were more common pets than dogs in Japan
 * The Shetland Sheepdog in the PAL and NTSC versions may be a reference to Shigeru Miyamoto's dog, Pikku, which possibly influenced his choice of the name "Pikmin."