Patrat is mostly brown with a tan stomach and face. Its tail is long and straight with a scruffy white tip. It has a large pointed tooth that sticks out of its mouth. Its head has a black, red, and yellow rings around its eyes, and 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.
Lenora owns a Patrat and was used against the gym match with Black.
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.
Patrat's Japanese name, Minezumi, is derived from 見 mi, looking, and 木鼠 kinezumi, squirrel.
Its English name, Patrat, 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."
Every Generation and region has had an early rodent-like Pokémon, with Patrat being Unova's variant.