Pikmin Chain is Pikmin & Olimar's Up Special Move. Captain Olimar creates a chain of Pikmin and uses it to latch onto a ledge. It functions as a Tether Recovery. The distance recovered is dependent on how many Pikmin Olimar has, and can either have an extremely long range or be completely useless. It has a little vertical rise, can be used to pseudo-spike edge hogs. It does not reorder your pikmin.
Origins
This attack doesn't come from the Pikmin universe. It was created just for Brawl.