The Sloshy Nostalgia is a treasure found in Hey! Pikmin. It is actually a can of corned beef.
Collecting the treasure
To get the treasure, get on the highest part of the hill and use the jetpack to get on the platform. Then, get on the second platform and grab the treasure.
Hey! Pikmin logs
“I'm not sure what this contains, but I think it's 100% pure nostalgia in liquid form. The animal on the picture seems to long for bygone days, though it's looking forward to better days. I truly understand how it feels! After all, I think often of the nice times I've spent with my family back home on Hocotate, though I'm sure that many are still ahead of us.”
Names in other languages