Diguda

Diglett is a tiny, brown Pokémon that seems to be perpetually buried within the earth, leaving only its head visible. Its small stature makes it both the lightest and shortest Ground-type. It has beady black eyes and a large, round, pink nose. A Diglett in Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team mentions that it has feet, though their size and appearance are unknown. It spends much of its time underground and has very thin skin. If Diglett is exposed to sunlight, its blood will heat up and cause it to grow weak.

Diglett lives in tunnels and caves under the earth, where it feeds on tree roots and vegetables. It is known to live in burrows left behind by . It also sometimes lives in burrows near forests and has even been shown to live inside of trees. Diglett digs regularly through the earth at a shallow depth, leaving perfectly tilled soil in its wake. Some farmers welcome Diglett because it tills their fields and its droppings enrich the soil, but others consider it a pest for eating their vegetables. As mentioned in Pokémon Sleep, Diglett is known to sleep underground during the night. Seeing a Diglett asleep above ground is considered to be good luck.

Forms
Diglett has a regional form: Alolan Diglett.

In Alola, Diglett has developed three fine gold whiskers on its head from living in soil with high iron content and volcanic environment. These whiskers function as sensors and allow it to monitor its surroundings without coming above ground, though it will still occasionally poke its head out to see outside. The whiskers can also be used for communication, wobbling around to relay mood or emotion. They stand straight up for anger, swing around for happiness, and droop for sadness.

Needing to be able to dig through Alola's volcanic rock, Alolan Diglett is notably stronger than its non-Alolan counterparts. In Alola, their tunneling activity has resulted in creating cultivated soil. This cultivated soil is good enough for agriculture. The people in the Alola region are said to be very grateful for the actions of Alolan Diglett. However, they are still very small, tying with and as the shortest Steel-type. They can also be found in the Coastal Biome of Blueberry Academy's Terarium, where Alola's island life is simulated.

Despite Diglett having a strong resemblance to Wiglett from the Paldea region, the two Pokémon species are not biologically related, having entirely separate diets and habitats. Their resemblance to each other is said to be a coincidental result of adaptations to their respective environments.

Evolution
Diglett evolves into Dugtrio.
Alolan Diglett evolves into Alolan Dugtrio.

(Source: Bulbapedia)