Seven of Nine was a Porygon2 liberated from
Team Plasma. When
Colress disbanded
Team Plasma after being defeated by Nate, he realized that a Pokémon's strength is brought out by its Trainer. Both Porygon2, Four of Nine and Seven of Nine, were not meeting their potential, and
Colress was determined to see them to their full strength. However, this lead to a split of ideals. Four of Nine believed becoming a Porygon-Z would get them closer to perfection, while Seven of Nine felt that sacrificing logic for versatility was not optimal. As their Trainer,
Colress facilitated their needs, allowing them to grow in the direction they wanted to.
With the invention of the Rotom-Dex,
Colress was spurred onward by his endless curiosity. This curiosity eventually manifested itself into
Colress Machine No. 1054, a cybernetic shell designed to house a Porygon-class Pokémon. Seven of Nine volunteered, as the concept seemed intriguing.