When against the last boss, bring 100 Pikmin, best is RED, to the door outside his lair. Then, bring in only 25 at a time.
When he opens his mouth, and starts wiggling: He is about to lick up all Pikmin in his path. Bring your pikmin to the side of his mouth, and throw them onto his face.
ULTIMATE STRATEGY: Just continually throw Pikmin onto his face, then when they fall off, summon them immediatly, and repeat. This worked for me, I have beat the game several times, and gotten all the parts, record-- 30 parts in 20 days. E-mail me if you have any questions about the game: Jeeneeus@hotmail.com
THERE ARE NO CHEATS FOR THE GAME!!!