Kanto Route 25

Route 25 is a route located in northeastern Kanto. It connects to Route 24 in the west. The Sea Cottage is located on this route, at the eastern end.

Heading from west to east, Route 25 initially begins as an extension to Route 24. To the east, Route 25 comes to a maze of shrubs which is full of Trainers ready to battle. Near the east end of the maze, there is a cuttable tree blocking an area that contains an item.

East of the maze, the route opens up to its widest point before condensing slightly near a pair of Trainers and the first of two ponds near the east end of the route, known as Cerulean Cape. To the north of a land bridge between the two ponds is the Sea Cottage, the home of Pokémon expert Bill.

Route 25 continues east, turning south at the ocean shoreline and passing along a narrow strip of land between the ocean and the eastern pond. At the southern tip of the pond, the route turns west, intersecting the land bridge as it runs along the southern edge of the ponds. Just to the west of the pond, the route turns north for a yard before doubling back to the west, running along the southern edge of the route's main path as it feeds into the "express route", one way portion of Route 24. The existence of the long, narrow bypass south of Route 25 allows for quick, hassle-free travel between Cerulean Cape and its namesake city. However, due to a ledge at the southern terminus of Route 24 in Cerulean City, the reverse is not possible.

In Generations I, III, and VII, the corner connecting Routes 24 and 25 is considered a part of Route 24. In Generations II and IV, it's included with Route 25.

Sea Cottage
The Sea Cottage is a small building located in the northeast of Kanto on Route 25, also known as Cerulean Cape and is a home to Bill. While experimenting with his Teleporter, he was accidentally combined with a Pokémon and he asks the player to help him by running the Cell Separation System for him. After he is back to normal, he rewards the player with a ticket for the S.S. Anne.