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Pokémon Dollar
From Bulbapedia, the community-driven Pokémon encyclopedia.
Poké Dollars is the name given for the currency used in the Pokémon world in Pokémon Colosseum.
The symbol used for them is generally similar to the sign for "Yen", but with a "P" design instead of "Y". The large amount cash required for simple items implies that the money might be closer to Yen than anything else.
Other names fans have come up for the monetary note over the years have been "Pokémon Dollars", "PokéMoney", "Zenny", "PokéYen" or "Pen".
Most fans simply refer to them as "dollars".