The Museum-Quality Egg is a treasure found in Hey! Pikmin. It is actually an Easter egg.
Collecting the treasure
Once you arrive at the area with multiple platforms and a Mockiwi on top, go right and you will find another Mockiwi. Once it is killed, move to the Hydroe bramble, but don't touch it, and use the jetpack to fly over it and collect the treasure. Fly back using the jetpack.
Hey! Pikmin logs
“I bet this is an artistic work made by an artist. I can't see inside, but I'm sure whatever it's filled with would turn the surface meaning on its head. That's how art usually goes.”
Names in other languages