Video of the highest possible score in challenge mode for The Forest Navel level, done on January 21 2005. Available in low, normal and high quality.
Author's comments: First off, I must give major, major thanks to Mikepharvey of the GameFAQs Pikmin forum, without whom, this video would almost certainly not exist. He was the first person to achieve this score, over two years ago. Since then, it has only been matched by a mere handful of individuals, and I'm confident that its replication would not have been possible without his thorough documentation of his strategy.
With that done, I must say that this score is of a caliber far beyond the other three possible perfect Challenge Mode runs. Unlike the others, there is no margin for error here. Everything has to go absolutely like clockwork. And of course, there is also some randomness to consider; for a perfect 482, the breadbug must drop two Blue 5 pellets, an event which only happens 1/9 of the time by chance (although thankfully, this event takes place at the beginning of the run). And somehow, things always manage to go wrong when you are lucky enough to get 2 blue 5's--I had many runs ruined by one of the 10 or 20 pellets from the back of the level getting "caught" on something.
FYI, there isn't any rhyme or reason to my actions at the end of the video. In my elation of seeing that all the last pellets were going in and that I had finally achieved the score, I just started running randomly away from the Onions. Oh well.