R.O.B.
A R.O.B. (which stands for Robotic Operating Buddy) is a peripheral for the Nintendo Entertainment System, Nintendo's first home console. R.O.B. has since featured in a number of Nintendo games as a character, including Mario Kart DS and Super Smash Bros. Brawl, which Captain Olimar is also a character in. In Pikmin 2, there are a number of treasures related to the device – its "head" is the Remembered Old Buddy; and the Gyro Blocks, all found in Hole of Heroes and all part of the Blast from the Past series, are blocks related to the peripheral.
In Super Smash Bros. Brawl
In a cutscene of Super Smash Bros. Brawl's Subspace Emissary, Captain Olimar battles a giant R.O.B. with Captain Falcon. Interestingly, giant R.O.B.s appear in both characters' games – in Pikmin 2, parts of a giant (in comparison to Olimar) R.O.B. are considered treasures, as stated previously, and in F-Zero GX, a massive R.O.B. appears in Port Town. A large R.O.B. also appears in the Brawl and Super Smash Bros. for Wii U stage Port Town Aero Dive as a result.