In the Pikmin series, There's often an intended solution to collect ship parts, treasure, fruits, gear and castaways. This page documents all non-intended ways to collect them.
Pikmin
Sagittarius: The water pool sorrounding the Saggitarius can be skipped by purposefully taking your pikmin into the water and calling them back out on the small ledge on the other side. You can therefore collect the Saggitarius without using blues.
Pikmin 2
Pikmin 3
Tremendous Sniffer: If you charge a Winged Pikmin or throw a Yellow Pikmin onto the fruit, the next day, it will be outside the wall.
Stellar Extrusion: In the Tropical Wilds, you are supposed to use 2 leaders to raise a seesaw block and get close enough to throw Pikmin at the Estellar Extrussion. But, by locking on to the fruit from a distance and charging Winged Pikmin, they may collect it, bypassing the seesaw challenge.
Astringent Clump: In the Garden of Hope, you are supposed to use all 3 leaders to raise and lower a weighted elevator platform and get close enough to throw Pikmin at the Astringent Clump. But, by locking on to the fruit from a distance and charging Winged Pikmin, they may collect it, bypassing the challenge.