This day is actually not that hard. With the exception of day one it is probably the easiest day. All you have to do is three game hours of tedious setup work, and then kill Emperor Bulblax. With practice you can have SIX game hours remaining when you get all the pellets and the Safe back. I have a movie showing how to beat EB. It's in Windows Media format and should be able from here for a while.
On this day you should always be able to breed 25 Pikmin - just make sure you send the pellets back to the right Onion. My best total score for Perfect Pikmin is a total of 740 Pikmin. This number can be beaten - maybe I'll try for 800 sometime.
Congratulations - you're done!