According to legend, the Three Generals were the first Pikmin Olimar plucked of each color. They traveled with him and the three Pikmin soon became the best of friends. Then, on the 29th day of Olimar's search, he finds The Final Trial. Excited to get home, he calls on 100 Pikmin (50 reds, 25 blues and 25 yellows), to come and make a path to where the Secret Safe lies. Olimar finally gets to the end of the area. He goes into the area, only to get a suprise attack from the Emperor Bulbax! Unable to fight back, Olimar loses 97 Pikmin that day (all except for the Three Generals). Fortunally, the foursome escape with their lives, and call it a day.
That night, Olimar becomes extremley depressed becuase he only has one day to find the final part. The Three Generals convince him not to give up, and Olimar decides to try and get that part, or die trying. So on Day 30, the foursome hatch a plan. The Yellow General grabs a Bomb-Rock and throws it at the unexpecting Bulblax. He becomes stunned, and the foursome see their chance the Pikmin jump on the Bulbax's back, trying everything to kill it, but to no avail. Then, the Bulblax uses his tounge to slurp up the Generals. Olimar, stunned, realizes that this is the end.
However, out of nowhere, the Bulblax lets out a scream a collapses, dead. A shocked Olimar look up to see the Three Generals crawl out of the Bulblax with the Secret Safe. Apparently, the Generals destroyed the Bulblax's iternal organs, killing it. Olimar, as happy as can be, helps the Generals carry the final piece to his ship. Before he lifts of, he awards the Three Generals white shases to wear across their bodies. Olimar then flies off, seeing the brave Generals attack a nearby Bulborb.
Legend has it thay after Olimar left, the Three Generals set up the government of the present-day Pikmin world. Even to this day, there is a shrine honoring each of them in the Final Trial area.