At the point where Route 9 becomes Route 10, a northerly path heads toward the river, as well as a narrow strip of land along the northern tip of Route 10 which is fenced off from the rest of the route. From this strip, Trainers who possess the ability to use Surf out of battle can Surf east along the river, then south past the remaining portion of the northern half of Route 10 (separated from the riverbank by a long fence) before turning west north of the Rock Tunnel's southern portal and making landfall just southeast of the building.
There is a lone Trainer located on the beachfront southwest of the Power Plant.
In Generation III, there is a back door to the Power Plant west of the building; however, a ledge prevents access to it.
Just east of the path leading to the river is the only patch of grass on Route 10. The main path of the route runs along the southern edge of the grass, turning south near the river. Directly south of the patch and east of the north portal of the Rock Tunnel is a Pokémon Center, one of only two in the region that is found outside of a populated area (the Center on Route 3 near Mt. Moon is the other). The building is separated from the Rock Tunnel by a string of shrubs and cuttable trees. Trainers can either Cut down one of the four trees or travel around the blockade, taking on a Trainer at the southern end of the blockade.
From the Trainer, the route returns north, following the west side of the blockade. The path juts west, then east to avoid a fence before reaching the Rock Tunnel's north entrance.
The south portion of Route 10 acts much like a North American traffic circle in that movement is restricted in a counterclockwise motion around a large mound in the middle of the route. From the south entrance of the Rock Tunnel, the route turns west, then south, passing two Trainers and hopping a ledge before encountering a third Trainer. Route 10 then turns east to meet a three-way intersection. The south path at this fork leads to Lavender while the east path continues to the east before curving north, traversing a pair of ledges via openings, and returning west to the Rock Tunnel's southern portal.
With the closing of the Power Plant, which was full of Electric-type Pokémon, and the renovation of the facility so that it is operational again, the Electric-type Pokémon moved into a new grassy patch located next to the Power Plant.
The amount of space between the southernmost point of the northern segment and the north portal of the Rock Tunnel was reduced by half. To compensate, the Pokémon Center was moved three paces south. The tree barricade between the Center and the Rock Tunnel was also removed. The southern segment of Route 10 was largely untouched, except for the removal of a Trainer and the relocation of another.
As a whole, the route was reduced significantly in size, as was the Power Plant itself. The Power Plant is taller in Generation I, but shorter and wider in Generation II.
Route 10 in this Generation is almost identical to Generation I, but a few changes are present. The fence south of the Pokémon Center is larger and goes from east to west in Generation III. The Power Plant is redesigned, and the tree in the east part of Lavender section is removed. The hills are taller, and the Power Plant now has a west exit with a hill after it.
The north half of the route is very similar to that of Generation II save for the enlarged tall grass and that the Power Plant uses the same design of FireRed and LeafGreen. The southern half of the route changes drastically, hills are added to give a more in-depth feel to the route, and the two ledges in the east are smaller and closer to each other. The inverse "L"-shaped hill is changed and now it's shaped like a square. A Strength boulder is placed left of the hill. TM69 (Rock Polish) is located behind it.
In the manga
Route 10 in Pokémon Adventures
In the Pokémon Adventures manga
Route 10 appeared in a flashback in Lapras Lazily, where Blue told Yellow about his encounter with Elite Four's Agathatwo years earier. He had been surfing on Route 10 when he came across a wildLapras, which he caught in order to add its data to his Pokédex. A Jr. Trainer named Evan had then showed up, telling Blue that he had been trying to catch the same Lapras for weeks now. Although Blue had refused to give him the Lapras, he had still chosen to help Evan after he had told him how his Haunter had disappeared into the abandoned Power Plant. Inside the Power Plant, the two Trainers had come across Agatha, who proved to be an extremely powerful opponent. Eventually, however, their teamwork had allowed them to retrieve Evan's stolen Haunter and drive Agatha away. As a sign of gratitude for his help, Blue had given Evan the Lapras he had wanted.
The fence and the tree barricade
The tree barricade mentioned above is very similar to the fence with the trees between the east tall grass and the entrance to this route in Route 9 in Generation IV.
In Generations I and III, a Picnicker mentions that she wishes that there were pink Pokémon with floral patterns. The Generation V Pokémon Munna fits this description.