Pikmin 2 cheats and cheat codes for Gamecube

Unlock Looie's Dark Secret move:
Finish all challenge mode arenas and reach "Pink flower" rating.

Unlock Shyacho:
Find 10,000 Pocos and save Hokotate Intergalactic Delivery.

Unlock Credits and Cinemas Option:
Find 10,000 Pocos.

Unlock Treasure Completion movies:
Find all the treasure pieces and save Looie.

Unlock Perplexing Pool:
Pick up the exploration map in the Awakening Wood.

Unlock Awakening Wood:
Pick up the sphere map in Emergence Cave.

Wistful Wild:
Repay the 10,000 pokos of your company's debt.

In-game reset:
While playing gold X + B + Start

Unlock challenge mode
Pick up the key after beated Beady Long Legs at the bottom 
of the Spider Citadle stage. Take the key the "recon drone".