S.S. Berry

The S.S. Berry is a treasure in. It is a strawberry-flavored with a white chocolate buttercream filling, with an elaborate berry-related decoration on the bun.

Plunder Palace
There is an S.S. Berry inside of the Giant Breadbug that roams around on the floor of sublevel 5 of the Plunder Palace. To collect this treasure, you must defeat the Giant Breadbug by beating it in tug-of-war twice; then, you must throw 3 Pikmin at it.

Cavern for a King
There is an S.S. Berry inside of a Titan Blowhog in the southeastern corner of sublevel 7 of the Cavern for a King. To collect this treasure, you must first defeat the Titan Blowhog, then throw 3 Pikmin at it.

Trivia

 * The S.S. Berry closely resembles the macaron worn by Red Sweetshop Decor Pikmin in Pikmin Bloom. It is also very similar in appearance to the red team Victory Macaroon from Bingo Battle mode in Pikmin 3.
 * At only two words, Louie's notes on the S.S. Berry are the shortest treasure notes in the entire series.
 * On the reversible cover of Pikmin 4, a Blue Pikmin is depicted trying to lift an S.S. Berry while a White Pikmin sits on top of it.