Pikmin Codes

Courtesy of GameFAQs
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Challenge Mode
Once you have saved your progress once, a new option will be available from the main menu: Challenge Mode. This mode lets you go back and compete in the areas that you have already opened up in the main game. The idea is not to find spaceship pieces, but rather to build as big a Pikmin army as you can before the sun sets. The biggest army scores are saved and entered into a ranking.

Fireworks
When you have four Pikmin around you, hit down on the D-Pad and you will lay down. Four Pikmin will then carry you like anything else they carry to an Onion and when you got flying up into it, shortly after you land, there will be some fireworks from the Onion.

Get 50 Pikmin
In the "Crash-site" area, go over the bridge you made from pushing the box over blow-up the wall blocking your path with yellow pikmin using bomb-rocks (they can be found inside the cardboard box).

Once in this area, you'll see three very large clams (Clamclamps). The one on the left has a part of your rocket, the one in the middle has a pearl, and the one on the right also has a pearl.

If you can defeat the clam and take it's pearl back to an Onion, you'll recieve a whopping 50 pikmin! This will work for any color pikmin.

Make Olimar Invincible
To make Captain Olimar invincible, simply press down on the D-pad. Olimar will lay down, then nothing can hurt him.