Porygon

Porygon is officially known as the Seizure Pokémon.

Purpose
Porygon's sole purpose was to create seizures whenever it appeared in any media. It attained this by using bright, flashing lights in typical Japanese style to mess with the brains of young children (and anyone else present).

Evolution
Porygon eventually earned itself an evolution, called Porygon Torture Mechanism. The torture mechanism was installed to create even harsher reactions in viewers, none of which appeared on TV. A later form was called Porygon-ZBR (zero brain reaction), designed to put people in comas.

Moves

 * Flashing Seizure Attack

Trivia
*DISCLAIMER: The "Porygon Incident" actually took place, and Porygon never appeared on TV again after that.
 * This is one of three Pokémon being used to wage war on the world. The others are Jynx and the Burger King Promotional Balls.