The Debt counter at the beginning of Pikmin 2.
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Pokos are 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 
x10,100 by visiting the Planet of the Pikmin, where collecting Treasures can pay off this supposedly immeasurably large sum of money. In comparison, x100 is more than a year's salary for the average Hocotatian. 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.
It seems that Pokos are used in Koppai (the home planet of the new captains in Pikmin 3) as coins that greatly resemble Pokos are seen in the 'Gather the Fruit' segments of Mission Mode.
It is unknown how pokos compare to real life currencies.
