Porygon is a Virtual Pokémon. It is based on early 3D animation models, and is thus created completely out of polygons. The various parts of Porygon's body are colored red, white, and blue. Its eyes are in the shape of hexagons.
Porygon can have the ability Trace or the ability Download. Trace copies the opponent's ability. Download increases Porygon's Attack or Special Attack depending on the opponent's defenses. It is the first artificial Pokémon, created by scientists at the Silph Co. company.
Porygon appeared in one of the most well known banned Pokémon episodes, Electric Soldier Porygon, which has hospitalized nearly 700 Japanese children due to flashing red and blue strobes causing them to have seizures. Due to the happened hiatus, the show skipped 4 months after the episode and it was never aired outside of Japan. However, it is available at YouTube (Watch at your own risk). It is based on an electronic system operator, and teleports with Ash, Misty, and Brock.
Due to the episode, "Electric Soldier Porygon", which caused 685 Japanese children to have epileptic seizures, Porygon has never had another appearance in the anime or in any film adaptation of the series, except for one brief cameo appearance at the beginning of the 2002 movie, Pokémon Heroes, and neither have its evolutions, Porygon2 and Porygon-Z, in an effort to block the traumatizing event from the minds of viewers even though it was Pikachu that one that caused the seizures with his Thunderbolt.