From Pikmin Fanon
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This article relates to the official games. See Pikipedia's "Poko" article for more official information.
A Poko

The Poko is the currency used on Olimar's home planet, Hocotate. This was first introduced Pikmin 2 and the plot concerned them. Olimar and Louie had to pay a debt of 10,100 Pokos by visiting the Planet of the Pikmin, where collecting 'treasures' can pay off this supposedly immeasurably large sum of money. In comparison, 100 Pokos is more than a year's wages for the President of Hocotate Freight. Pokos are ovular, and thin, and are made of some sort of golden-colored material. They bear a strong resemblance to the coins found in the Mario series of video games.