Kanto Route 1/Differences between generations/Generation I and III

The route layout in Generations and  are identical except for the fact that the Generation I version has grassy patches to both the east and the west of the route itself. The grass beyond the barrier was removed since in Generation I, s could enter the grass using the walk anywhere glitch and, upon doing this, the game would freeze. This was because the grassy area contained no data for cities, routes, or even wild Pokémon, and the game would crash upon trying to retrieve the missing data.

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.