Route 31 (Japanese: ３１ばんどうろRoute 31) is a route in central Johto, connecting Route 30 and Violet City. The western entrance to Dark Cave is located on the eastern part of the route.
This route is the third route that Trainers starting in New Bark Town will arrive at. Like the route before it, Route 31 contains more than an even share of ledges that players need to go around to get to Violet City, but may jump over on their way back. A small pond is north of the route, just west of Dark Cave. Featuring few Trainers and a small area, all that a traveling Trainer really has to look out for on this route are the wild Pokémon.
There is a man who seems to be in a sleep-like state that is located next to the pond. He doesn't actually do anything when first encountered, but will be useful later on in the game. At the gate on Route 35 leading from Goldenrod, there is a guard who will give the player a Spearow with Mail attached to deliver to this man. However, at least in Generation IV, any Pokémon holding the mail will suffice, and he won't keep a Pokémon he "doesn't know".
After he receives the mail, the man will give the player TM50 (Nightmare) as a reward; in Generation IV, the prize has become TM44 (Rest).
This section is incomplete. Please feel free to edit this section to add missing information and complete it. Reason: Check if Sitrus Berry is version exclusive and if Lum Berry is obtainable in HG/SS.