The Justice Alloy is a treasure in Pikmin 2. It is found on the 7th sublevel of the Snagret Hole where it is held by a Pileated Snagret. It gives the Metal Suit Z once collected. It is the 193th treasure on the List of Pikmin 2 treasures.
Captain Olimar's Journal
"I found this metal treasure in the gut of an avian snake. It took real courage to drop into that dark den, but danger's what I do best. In honor of my brave clash with that feathered serpent, I've named that den the Snarget Hole."
"You cannot see it and you cannot touch it, but it is definitely here and there. What, you ask? Whatever this suit is fortified by, that is what. I cannot believe there is a better material than what I am constructed of..."
Since the Justice Alloy was eaten up by a Pileated Snagret. Olimar must throw Purples at it to kill it and avoid when it goes underground. Once it pops up, he must keep the Purples away from it, but he shouldn't underestimate his Sprays. Olimar must get the Nectar x his Purples have leaves.
Another strategy is to use White Pikmin. It should eat the Whites and the boss will be poisoned.
To get more sprays, he should keep on getting various berries. It is an important idea to get more as he'll run out of sprays.