Kanto Route 4/Route description/Eastern segment

From Mt. Moon, Route 4 travels to the east, swerving to the north and the south to avoid ledges along the route. The path turns north, then east near a large clump of trees surrounding a grassy area. The route is a very strange route as the ledges form a contour down the mountainside, leading Trainers due east and then south to the end of the path and a ledge that will force Trainers to go down it into a large clump of trees surrounding a grassy area. After going down this ledge, there is no return and Trainers must go east to reach Cerulean City.

Route 4 can, in fact, be reached from Cerulean City, by using, Trainers can Surf along to western part of Route 24, south to Cerulean Cave. Trainers can then travel west, past a on the highest hill, and then jump down the remaining ledges to access this section of the route.

Due to a ledge that separates Mt. Moon from Cerulean City, Trainers cannot return to the previous towns until they travel through Diglett's Cave and use on, use  to return to the cities west of Mt. Moon, or use  down from  (in Generations I and III only) or all the way around through Cinnabar Island. The majority of the route is fairly straight-forward as there is only one true way to proceed on the path and there are no s to battle (with the exception of the on the highest hill on the route; however, she is reached only by way of the waterway that begins on ).

Depending on the Generation, there are items, Move Tutors, or both along this path. In Generation III, two Move Tutors were added to the route. Located near the Mt. Moon entrance, these tutors will teach a the moves  and, but only once. Both tutors are jealous of the other's skills and will try to get Trainers to come to them instead of the other.