Diglett

Diglett is a Ground-type Pokémon from the Generation I games. At level 26, it evolves into Dugtrio. Diglett is a small mole that pokes its head out of the ground. Similarly, Dugtrio is essentially three large Digletts poking their heads out of the same hole in the ground. In the main Pokémon series, Diglett has a high Speed stat, often allowing it to attack first, although its HP stat is very low.

Since Pokémon Sun and Moon, there is a Ground/Steel-type variant of Diglett encountered in the Alola region. Like its regular counterpart, an Alolan Diglett evolves into an Alolan Dugtrio at level 26.

Pokémon Red and Blue Versions
In Pokémon Red and Blue Versions, countless wild Diglett and Dugtrio inhabit Diglett Cave, a tunnel connecting Pewter City to Vermilion City. The tunnel was built by large hordes of Digletts, and has since become a tourist attraction within the Kanto region.

Pokémon Diamond and Pearl Versions
In Pokémon Diamond and Pearl Versions, Diglett are less common, but they can be found on Route 228.

Pokémon Snap
In Pokémon Snap, Digletts appear in the Tunnel Course, where they pop out their heads around a Pikachu. As photographs of Digletts are taken, more of them begin to appear, and eventually a Dugtrio as well.

Pokémon anime
In the Pokémon anime, Diglett and Dugtrio first appear in Episode 31, "Dig Those Diglett!", in which a large herd of them are attempting to stop the construction of a dam. When Pokémon Trainers recruited to fend off the Diglett attempt to call their Pokémon out of their Poké Balls, the Pokémon protest by refusing to come out (which happened to Ash's Squirtle and Gary Oak's Pokémon), apparently supporting the Diglett's efforts. The Diglett eventually succeed in their efforts by using Team Rocket to destroy the partly-constructed dam. This episode is one of the first episodes in the anime to show that wild Pokémon take an active role in the care and maintenance of their environment. It also shows that they are capable of taking action against human intrusion or actions against it.

In Episode 116, "The Underground Round-Up!", a group of Dugtrio and Diglett are used by Poncho, a Diglett Rancher, to herd troublesome Electrode away from a city into the wild by using underground tunnels.

In Episode 145, "Goin' Apricorn!", a herd of Diglett take on the job of protecting Apricorn trees from Team Rocket. They dig pits that lead to a maze of tunnels, successfully leading Team Rocket away from the trees.

In Episode 220, "Plant it Now...Diglett Later", a herd of domestic Diglett are involved in an intricate but harmless scheme played on a village of senior citizens by their grown children to keep their parents busy and active. The sons of these elders dress as soldiers called "The Band of Pokémon Thieves" (which died out years ago), pretending to attack the village with the Diglett. After the "fight" has gone on for awhile, the soldiers pretend to surrender and move off, leaving their parents proud of their victory and off to prepare for a repeat performance in two years.

Physical description and traits
Diglett are very small moles who are very similar to the artificial moles used in arcade games. It is only ever seen by its head poking out of the ground. Diglett's head is round and covered in short brown fur. Diglett has two small black eyes and a large roundish pink nose. Diglett's Pokédex height is eight inches, which is likely a measurement of its which it sticks out of the ground.

Some believe Diglett has legs that it uses to dig, while others believe it is limbless and instead burrows like a worm or snake. The latter is supported in Pokémon Snap, in which Digletts can be seen leaping out of their holes. However, in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team, a Diglett mentions that it feels that its feet are still walking in the air. Although it has no visible appendages, Diglett can use Cut, Scratch and Slash.

Diglett's thin skin makes it vulnerable when it spends too much time above ground. The sunlight can heat up its blood, weakening the Diglett. Therefore its natural habitat is underground, usually about one meter below the surface. When Diglett burrows along at this shallow level, displaced soil can be seen along its path above ground as a result. This makes it popular among farmers, who use Diglett to till their fields, preparing them to grow crops.

Diglett's natural diet consists of the roots of wild plants it finds while burrowing. It also likes to live in the huge tunnels made by Onix, due to leftover scraps of food.

Etymology
Diglett's name appears to come from the words "dig," because of its tendency to dig underground, and the "let" suffix, which refers to Diglett's diminutive size. Diglett's Japanese name "Diguda" simply refers to the word "dig". In Some English pre-release builds of Pokémon Red and Blue Versions, Diglett was named "Digda," before it was given a distinct English name.