Bidoof have long been renowned in Unova as the great builders of the pokemon world, for they are a pokemon who work tirelessly and with surprising efficiency. Yet Unova's finest fur trappers were nonetheless puzzled by the request from Sinnoh for dozens of live Bidoof to aid with construction; they accepted, for the money was too good to pass up. But they were right to be puzzled, for the engineers and builders of Sinnoh soon found (like the people of Unova had long ago) that, while Bidoof were capable of providing some aid, their construction methods were simply not designed to human specifications.
Bidoof use their front teeth to carve and at times carry stones, and the conspicious indentations they left behind did not appeal aesthetically to Sinnoh's people, who mistook them for cracks born of weakness. The stones themselves were designed for humans, who are of course far larger than Bidoof, and the stonemasons soon found that it took longer to construct buildings while training them than it would with only human help.
The Bidoof were released into the wilderness, where today they poses an apocalyptic threat to Sinnoh's ecosystem. Bidoof not only have chaotically diverted the flow of Sinnoh's streams and rivers, they have dramatically multiplied in number, and today they are as endemic as the Starly, yet still growing more numerous by the day. Many have been taken from the wild as pets and battle pokemon alike, and the Bidoof have become quite popular in both roles, but this has proven insufficient to keep their population in the wild down. Dramatic action may be needed to protect Sinnoh's other pokemon from the menace of Bidoof expansion, lest this island become the home of no more than Men, Starly, and Bidoof.