The complete Pokemon RBY pokedex, part 13

Pokémon Name: Porygon
Type: Normal
Classification: Virtual Pokemon
Pokédex Number: 137
Ability: Trace and Download
Dream World ability: Analytic
Useful Attacks: Lock-on
Location Found:
Diamond/Pearl: Trophy Garden
Platinum: Veilstone City (house near Galactic HQ)
HG/SS: Celadon Game Corner
Black: Trade, Poke Transfer
White: White Forest (required resident: Herman)

The first Pokemon to be made entirely out of computer code. Its evolutions have improved the tech over the years, making the original Porygon as outdated as Nintendo 64 graphics.

Evolution: To Porygon2 via Up-Grade