User blog comment:Axsud/Maliwan Tsunmai/@comment-1729807-20100427160839

Please check the Tsunami page - I've recently added loot pools to all of the pearlescents. "The Tsunami has a chance to drop from Badass Desperadoes, Badass Engineers, and Badass Infantry. Like all pearlescents, the Tsunami can also be dropped from Crawmerax and found in Crimson Lance weapon chests."