Kanto Route 4/Differences among generations/Generation IV

Other than graphical updates, the basic layout remains the same as previous generations, but the route is no longer flat, with hills leading down from Mt. Moon to add more depth to the route. Like Generation II, the western portion of Route 4 was cut off and changed to an extension of Route 3. Due to this, Route 4's western entry starts at the eastern entrance of Mt. Moon. Items and Trainers remain the same as in Generation II. Unlike in Generation II, Cerulean Cave remains in Cerulean City, however, unlike Generations I and III, there is no return to this route from the cave, likely to prevent the player from traveling to west Kanto without restoring the Power Plant.