Porygon

Porygon is a Pokémon found in each Generation of the Pokémon Series. Porygon is a Normal type Pokémon.

Etymology
The word Porygon is a play-on of the word polygon. Polygons are plane figures with three or more sides and typically four or five, and so because of this this is where Porygon gets its name.

Evolution
Porygon started in Generation I and II with no evolution. However, in the third generation, Porygon could evolve into Porygon2 whilst holding the Up-Grade during trade. Then, in the fourth generation, Porygon could evolve into Porygon-Z whilst holding the Dubios Disc in trade.

Ability
Porygon has the Download ability or can have the Trace ability.