Some say that four Donphan atop a Torterra are the pillars on which the world rests. In reality, it are the Dugtrio which have the best claim to this title.
Dugtrio, like Diglett, have long been believed to be rodents, based on their small height, faces, and claws, the latter revealed only for certain attacks. At times, they appear to defy the laws of physics; even when released indoors or in midair, they materialize on the ground, a small head poking out of the surface. Ancient philosophers have speculated on what was beneath the surface, but digging only met with ferocious hostility and earthquakes, so no such information could be confirmed.
Recent geological advance have revealed Dugtrio to be a pokemon so enormous it dwarfs Wailord, one whose rounded pillar-shaped body reaches into the Earth's mantle, and those seen above the surface are a tiny fraction of the species' whole. They are as common meters below the surface as Rattata on land or Zubat in caves. It is only their narrow width which prevents massive earthquakes every time one is caught.
When too many are captured, the earthquakes do occur, and when angered or in battle Dugtrio often create their own small quake, one typically too weak to topple buildings. Together, they have frequently used this enormous, earthquake-causing size as a weapon. Cities which dug too carelessly and deep for mineral wealth, without any concern for pokemon or environmental damage, have often found themselves buried in the very ground they sought to dig up, trapped forever for the sin of angering the Dugtrio.