Pikmin 2 Cheats

Control title screen: 
Press Y at the title screen to make a Chappie appear. Press C-stick Left or C-stick Right to move it around. When it is close to the Pikmin in the logo, press Z to make it eat them. Press L to make the Chappie disappear.
User Cheat by AlanScott

Press X at the title screen to make a beetle appear. Press C-stick Left or C-stick Right to move it around. When it is close to the Pikmin in the logo, they will also begin moving. Press L to make the beetle disappear.

Press R at the title screen to make the Pikmin that make up the title text to change into a "Nintendo" pattern.

Challenge mode: 
Defeat Beady Long Legs at the bottom of the Spider Citadle and collect the key. Take the key the "recon drone".
User Cheat by LittleMinions

Cinemas and credits option:
Collect 10,000 Pocos.

Treasure completion FMV sequence:
Collect all the treasure pieces and rescue Looie.

Looie's Dark Secret FMV sequence:
Finish all challenge mode arenas with a "Pink flower" rank.

Awakening Wood level:
Get the Sphere Map in the Emergence Cave level.

Perplexing Pool level:
Get the Exploration Map in the Awakening Wood level.

Wistful Wild level:
Collect 10,000 Pocos and save Hokotate Intergalactic Delivery.

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

Looie's Cooking Notes:
Rescue Looie from Titan Dweevil at Dream Den.