Patrat is a rodent-like Pokémon that resembles a chipmunk. It has mostly brown fur, with a tan-coloured stomach and face. Its tail is long and straight with a scruffy white tip. It has a large pointed incisor tooth that sticks out of its mouth from its upper jaw. It has a black band circling its head and eyes, which appear to have red and yellow bands around its small black eyes (The rings are seen as being separate from the actual eyes when it is put to sleep). Its feet are small and black, with three toes on each foot.
Patrat was shown in a trailer preceding the Phantom Champion Zoroark on July 6, 2010. It was officially revealed on the August's issue of Coro Coro along with other six Pokémon on July 11, 2010.
Every Generation and region has had an early rodent-like Pokémon, with Patrat being Unova's variant.
Patrat appears to be based on a chipmunk.
Patrat's English name is probably derived from the words "patrol" and "rat," since they always keep watch over their nest and resemble rodents, a member of the rodent family being rats. It also sounds similar to "pack rat".
Its Japanese name, Minezumi, is derived from 見 mi, looking, and 木鼠 kinezumi, squirrel.