From Bulbapedia, the community-driven Pokémon encyclopedia.
The Rocket Brothers are a family of Team Rocket Grunts. They are among the 30 Team Rocket Grunts to infiltrate Silph Co.. Prior to battling, each brother declares himself as one of the four Rocket Brothers. Afterwards, the brother will warn the player that his brothers will avenge him, even if the player has defeated the other three brothers. Defeating all four Rocket Brothers (or not defeating them, or else only defeating some) has no bearing whatsoever on the storyline. Moreover, the Rocket Brothers are never seen again after Team Rocket is cleared out of Silph Co.
Pokémon
Brother on 6th floor
Brother on 7th floor
Brother on 8th floor
Brother on 9th floor
Quotes
Brother on the 6th floor
- "I am one of the four ROCKET BROTHERS!"
- "Flame out!"
- "No matter! My brothers will avenge me!"
Brother on the 7th floor
- "I am one of the four ROCKET BROTHERS!"
- "Aack! Brothers, I lost!"
- "Doesn't matter. My brothers will repay the favor!"
Brother on the 8th floor
- "I am one of the four ROCKET BROTHERS!"
- "Whoo! Oh, brothers!"
- "I'll leave you up to my brothers."
Brother on the 9th floor
- "I am one of the four ROCKET BROTHERS!"
- "Warg! Brothers, I lost!"
- "My brothers will avenge me!