Team Rocket scientists are either members of or contracted by Team Rocket to develop new technology. They help design and implement many of the devices used in Team Rocket's plans; they also experiment on Pokémon.

In the games

Red/Blue/Green/Yellow/FireRed/LeafGreen

In Pokémon Red and Blue, Pokémon Yellow, Pokémon Green, and Pokémon FireRed and LeafGreen, some of the Silph Co. scientists join Team Rocket in exchange for power and money. Both they and the Team Rocket grunts attack the player to stop him or her from saving Silph Co. from the Rockets.

Sevii Islands

In FireRed and LeafGreen, when the player obtains the Sapphire from the Ruin Valley cave, Rocket Scientist Gideon drops down and steals it. The player faces him after defeating all Rocket grunts in a local warehouse. After defeating him, the player is told about Giovanni's son and reads a file regarding a high-frequency sound wave machine which would influence Pokémon evolution.

Gold/Silver/Crystal

A group of Rocket scientists, as well as grunts and Team Rocket executives and administrators, tries to stop the player from destroying the high-frequency sound wave machine which would influence Pokémon evolution.

Pokémon

Red/Blue/Green/Yellow/FireRed/LeafGreen

• Magneton
• Koffing
• Weezing
• Magnemite
• Grimer
• Electrode
• Voltorb
• Muk

Scientist Gideon (FireRed/LeafGreen only)

• Level 46 Voltorb
• Level 46 Porygon
• Level 46 Electrode
• Level 46 Magnemite
• Level 46 Magneton

Gold/Silver/Crystal

• Magnemite
• Koffing
• Ditto
• Porygon

In the manga

Red/Blue/Green/Yellow/Gold/Silver/Crystal

In the Kanto and Johto sagas, Rocket scientists do not make many appearances as they appear to be keeping to the shadows. In fact, the only Rocket scientist to be known to the public is Blaine, who helped on the Mewtwo Project.

In Chapter 20, it was shown that the Eevee Red was asked to get for Erika was part of the "Eevee Bio-Engineering Scheme" that would allow Team Rocket to have a weapon with the skills to make an Eevee transform freely among its evolved forms without the use of evolutionary stones. The scientists did this at Giovanni's command.

Most of the scientists were killed when Mewtwo destroyed the Cinnabar Lab in Chapter 34.

In the anime

Giovanni hired Dr. Fuji to use his team of scientists to find and clone Mew. Dr. Fuji agreed out of the hope that the money given to him to develop the cloning technology would allow him to make a replica of his late daugher Amber. The scientists succeeded in cloning Mew, and Mewtwo was created; however, soon after its awakening, Mewtwo destroyed the lab in which it was created and the scientists within it.

Several years later, other Rocket scientists worked under Professor Sebastian, making the forced Pokémon evolution beam and the crystal system that traps the Electric Pokémon Raikou. Further into Johto, a team of Rockets working under Namba managed to trap two Lugia, a mother and child. Namba was last known to be researching the possible uses of Pokérus.