Using food stored in cheek pouches, they can keep watch for days. They use their tails to communicate with others.
– Pokemon Black Pokedex
Patrat is Unova’s early-route Pokemon, the equivalent of Rattata, Sentret, Poochyena and Bidoof. When it first came out, it seemed strange that it’s based on a rat when Rattata is already based on a rat (though Patrat may be more based on a chipmunk or something). The fact that it’s the Scout Pokemon and always looking around reminds me of Sentret as well. Its eyes make it look like it either hasn’t slept in a long time, or is wired on caffeine or drugs, haha.
In the Black/White games, at the Dreamyard, there’s a youngster named Joey, who has multiple Patrats, probably a reference to the famous Youngster Joey in Johto who has a “top percentage” Rattata.
Stat-wise, it’s got more Attack and Speed, but low base stat total. It’s one of the few Pokemon who can learn both Mean Look and Baton Pass (the other being Umbreon). However, Mean Look’s effects can no longer be Baton-Passed in Gen V.