I just looked at the Pikmin-box and saw, that on the backside all the 5 Pikmin in the game are listed - and a little separated the white and purple Pikmin (from Pikmin 2). The text beneath it is in german: ' Auch mit dabei', that means roughly translated 'also included'. Now I played through the story, and never encountered these two types of Pikmin. But I didn't picked up all fruits and I didn't played the missions and bingo-battle. So in which part are they included, can they be unlocked or how does that work?
EDIT: And why I can tag the thread only with Pikmin 3 (Wii)???