The eastern terminus of Route 13 is actually located on part of the Silence Bridge. The structure heads south, then west along a treeline before reaching solid ground near the southeast corner of a large maze of fences that occupies the entire length of the route. From this point westward, Trainers can no longer access the large water body that runs along the southern edge of the route due to a series of shrubs and fences that line the route.
Due west of the maze's east entrance is a hidden PP Up, the location of which is pointed out by a nearby sign. In the northeast corner of the maze is the lone patch of grass along Route 13, accessible only by using Cut or Chop Down to remove a small tree in the way.
On the other side of the maze, the route turns to the south as it becomes Route 14.
Use select to switch items in the Items window.
Look, look! Look to the left of that post!
Differences among generations
Generations I and III
Between Generation I and Generation III, there are no major changes to the route at all. However, the hidden item in the fence that was originally Calcium in Generation I was replaced with PP Up in Generation III.
Among the most notable changes in Generation II was the reduction in the length of the route by roughly 60%. Equally notable was the reduction in the number of Trainers from thirteen to five.
The route is nearly identical to Generation III. Like Generation II though, the entire maze area is Route 13 instead of being split between Routes 13 and 14. Also, the number of Trainers on this route is now 10.
His party is also composed of Pokémon whose names have the word "king" in it; in the Generation II games, the Magikarp (Koiking in Japan or Ingeoking in South Korea) he has in the Japanese and Korean versions was changed to a Seaking in the localizations to keep with the theme. This change was not replicated in HeartGold and SoulSilver.