Kanto Route 4/Differences among generations/Generations I and III

Route 4 endured minor cosmetic changes but was not unchanged. The "gates" or the gaps in the ledges used for passed up them on the eastern segment were widened significantly, while the patch of tall grass near the Cerulean City entrance has grown in size covering the entire area. In the western segment, rocks and boulders had been included in Generation III for visual effect. Apart from this, most aesthetic features have been enhanced. Trees have become bigger, flowers are more visible, and most other sprites have been upgraded to Generation III standards.

Aside from cosmetic changes, two Move Tutors were added to the east portion of the route. Located near the Mt. Moon entrance, these tutors will teach a the moves  and. Both tutors are jealous of the other's skills and will try to get Trainers to come to them instead of the other. Other than this, only item positions and types were changed. , located on the second-highest hill was changed to. The hidden in the west segment was replaced by two Berries; a  and a Persim Berry in similar locations.