Pokos itself is one of the older, and more obscure words in Latin. As far as can be determined, it originated in Northern Italy as the name for a local deity, also known as Pikat-shoo. The Italians who worshiped this god were polytheistic, and Pokos was their god of thunder and lightning. Most of this sect's gods were bestial in origin.
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The truth is, Pokemon originates from the name of the ancient god Pokos. Advertizers decided to claim otherwise, and made up the clever idea of "Pocket Monsters" to cover up the true origins of the game.