Pikmin cheats and cheat codes for Gamecube

Unlock Challenge mode option:
Once you save the game at any point during the game play, you can access 
to "Challenge Mode" option form the main menu. You can replay any finished 
stages in a time attack. Collect as many Pikmin as you can before night.

Stay unharmed
Push Down on D-pad and Olimar will lay down. 
If he has any Pikmin with him, 5 of them will carry him to the Onion 
and the rest will stay behind.

View Fireworks
Remain idle or push Down on directional pad to round up four Pikmin to 
carry you back to your base camp.

Watch the Captain's logs
Hit Y on the area selection screen to watch Olimar written discoveries.

Faster Pikmin
Hold A button to pick up your pikmin, if you have only one slow Pikmin.

Different Pikmin colors:
When you begin a game, you can get Red Pikmin.
You can get Yellow Pikmin when you get to the 
After you go to Forest Of Hope area you can get Yellow pikmin.
When you reach the 3rd area at Forest Navel, you can get the Blue Pikmin 
Blue Pikmin can be on both land and water. The blue piknim can serce as
lifeguards for drowning Yellow and Red Pikmin.

Purple Pikmin
If the Puffstool in the Forest Naval spores your Pikmin, they will 
become Purple and sprout a mushroom on their heads.

Flower Pikmin
If the Flower Pikmin die, they leave a seed behind. It will sprout into 
a Leaf Pikmin the next day.

Kiling shock :
When you are fighting titan dweevil(the boss of the game) and it is 
going to use his shock attack you must think that attack affect all the 
camp except the end. But I discovovered that it is just between mines