Rattata is a small, quadrupedal rodent Pokémon. It has purple fur with a cream-colored face, paws, and underbelly. It has narrow eyes containing white sclera and pupil with red irises, rounded ears with cream-colored insides, and a single whisker on each cheek. Its long tail is tightly curled at the end. Its most notable feature is its large teeth. Like most rodents, its teeth grow continuously throughout its life and must be worn down by gnawing. Females will have shorter whiskers.

Rattata can live wherever it can find food, which it searches for most of the day. Thanks to its sharp fangs, it is able to chew on nearly anything. When it is threatened, Rattata can deliver a powerful bite. Rattata constantly keep their ears up and will immediately scurry away from the slightest sound. Furret is the natural predator of Rattata. Its hardiness lets it live in many environments, although it mainly lives on plains and savannas. Because it reproduces so quickly, a pair of Rattata can quickly colonize an area.

Forms
Rattata has a regional form: Alolan Rattata.

Rattata are non-native to Alola and arrived in cargo ships. The Rattata population in Alola was booming until Yungoos and Gumshoos were imported as a control measure. In order to avoid these new predators, Rattata altered its habits. It moved to more urban areas, became nocturnal, and formed large nests led by Raticate. Alolan Rattata searches out fresh food by smell and ignores anything spoiled. It has even been known to sneak into people's homes to find food. It has dark gray fur and grayish-purple ear insides. There are two tufts of fur on each ear and near the tip of its tail. Its long, thin whiskers are replaced by shorter, thicker tufts of fur as well. The line where its cream underbelly meets its gray fur is ragged instead of smooth.

Evolution
Rattata evolves into .
Alolan Rattata evolves into Alolan Raticate.

(Source: Bulbapedia)