In Pikmin 2, you just get "The Key". In Pikmin 1 and I believe Pikmin 3, you have to beat the game.
Get all three types of Pikmin in the Story mode, and the Challenge mode will be unlocked on the main menu.
To unlock Challenge mode, you need to collect The Key from the final floor of the Citadel of Spiders, a cave in the Perplexing Pool.
Complete every mission without losing one Pikmin and you will unlock the last video. It is recommended to not go for every treasure when doing this, just the key.
No there is not a Pikmin that will give you more or additional Pikmin.
No. White Pikmin made their first appearance in Pikmin 2.
After you save Louie, the entries in the Piklopedia will be updated with Louie's notes if you discovered that monster.
Although it's an unconfirmed pikmin, it will most likely to be nature
In Pikmin for the wii you need have a group of pikmin by you then press 1 and the pikmin will carry you back to their onion.
If you are talking about pikmin 1 then there is the infected pikmin.
Yes. The graphics in Pikmin 2 improved noticeably over those in the original Pikmin.
Yes. Blue Pikmin can serve as lifeguards and, when they are idle or thrown, toss drowning Pikmin onto dry land.