Scientists do not fully understand the tectonic process that produces Wiglett, occurring as it does within the Earth's crust. What is clear is that subduction in the continental shelf produces these pokemon, just as a similar process on dry land gives rise to Diglett. Opinons vary on whether these mysterious pokemon populate the earth's core or the deep ocean, and are merely transported by tectonic action, or whether some geological process creates Wiglett ex nihilo and leaves them to swim onto the beach. Although Wiglett were once thought to be the result of convergent evolution with Diglett, the species appear in truth to be relatives; science teachers can still use these pokemon as an example, however, because they are completely unrelated to Tynamo!

The fossil record confirms Wiglett's great antiquity, and Wiglett fossils are often found far from modern coastlines. Paleontologists, once they learned to distinguish their fossils from those of Diglett, have used these pokemon to map out a history of continental drift. There is also a suggestion that feeding on these pokemon has led to the creation of a consistent ecological niche of Wiglett feeders, filled primarily in modern times by Kilowattrel and Cramorant, but in antiquity by Aerodactyl and perhaps Tropius.

Every now and then, a Wiglett disturbed by a dig turns out to be not so fossilized, but the distance from the ocean usually sees them mistaken for a rare color variety of Diglett – albeit one who struggles to retreat into dirt, finding it much tougher to dig through than sand. Whether these Wiglett have burrowed through space-time anomalies, ala the strange reports of Porygon in the Hisui era, or whether they remained dormant underground for millions of years, remains the subject of active scientific dispute.