Route 31 is an extremely short east-west route encountered early on in Johto. Essentially it only serves as a connecting route between the northbound Route 30, its easternmost point and the gates of Violet City, its westernmost point. It also provides an entrance to Dark Cave.

Pokemon Avaliable: Bellsprout, Caterpie, Weedle, Pidgey, Ledyba, Metapod, Kakuna, Hopipp, Spinarak, Hoothoot* ,Gastly*, Zubat*, Spearow.

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*Note that these pokemon only come out at night. You must state that it is nighttime on your adventure in order to be able to capture them.