A diamond is indeed a polygon. It's a closed figure lying on a plane and constructed of straight lines.
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On Pokemon Diamond, Porygon evolves not by level, but by trade while holding the upgrade. Then you trade the newly evolved Porygon-2 with the Dubious Disc and receive a Polygon-Z, which is the final evolution of the Normal type Pokemon. And you like pee-pee.
There is a Porygon, but no Polygon ... but the only special think about Porygon is that it's rare and hard to get.
Pokemon diamond
A diamond. That is red.
diamond