A large rock falls from the wall, and holes in the ground cause a multi-truck pileup. Pikachu hears Pokémon saying “Diglett” over and over from underneath the ground. Meowth watches from above as a Diglett pops out of the ground. As Pikachu runs over to greet it, Diglett suddenly goes back underground. Ash and his friends rush to a hysteric foreman’s side, as he tells them to look at the Diglett in the distance. The Diglett are popping in and out of the ground. When Misty comments that they are very cute, the foreman yells at her, exclaiming that they are preventing them from building a dam. Ash scans Diglett with his Pokédex, which says that people can recognize their movement from the upturned earth. Ash then comments that he doesn’t see any upturned earth. The foreman says that it is because the ground is covered with concrete, but if they look closely, they can see movement in the form of small quakes and cracks. The foreman fears that they may not be able to achieve their dream of building the Gaiva Dam.
(Source: Bulbapedia)