Pikmin 2 Cheats for GameCube

Press L to make the Pikmin spell "Pikmin 2"
Press R to make the Pikmin spell "Nintendo"
Press X to make a bulborb appear. Use C stick to control it and press Z to make it eat Pikmin. If you eat enough Pikmin with it, you can make the Pikmin 2 and Nintendo logo that the Pikmin spell look weird and funny.
Press Y to make a flint beetle appear. Use C stick to control it.

I can't remember there name but they shot out rocks that are atracted to you and they follow. Its redish colored and if you see one and you want to get kill it get you're pikmin back if you have any just use olimar. Go up to it but not to close then when it gets ready to fire move out of the way. When it shoots out the rock it will go out a little ways then start to turn at you run around the creature it will come and hit the creature it will be almost down you will have to do it agian if he is not down already.

At the title screen where it says press start hold L until all of the Pikmin are off the screen. Then hold R and after a few seconds let go. The Pikmin should spell Nintendo!

Here are some cheats:
Challenge mode:
Beat the boss of the first hole in perplexing pool and bring the key to the ship
Purple Pikmin:
Go to the final floor and go to where those purple flowers are in the emergence cave and toss your red,yellow,or blue (yellows and blues are for returners) and you will get purple pikmin.
Yellow Pikmin:
Go to perplexing pool and go left and up a bit and you will find a new enemy.beat it and keep on going up till you get to the stone platforms and toss all of your pikmin excep one on the land up and toss one pikmin on the other stone platform and wait and it will fall and where Louie or Olimars platform will raise. Go right and up dismiss your Pikmin and call your red Pifmin to beat the fiery bulborb and dismi..

Unlock Challenge Mode:
To unlock the Challenge mode unearth the key item that is found on the fifth
floor of the Summer stage's first dungeon.
Unlock Treasure Completion Sequence:
To unlock the treasure completion sequence collect all the pieces and rescue Looie.
Unlock Shyacho:
To unlock Shyacho collect 10,000 Pocos to save Hokotate Intergalactic
Delivery then choose continue.
Unlock Cinemas and Credits:
To unlock the cinemas and credits collect 10,000 pocos.