Kanto Route 9/Differences among generations/Generation II

In Generation II, the route was shortened by roughly 30%, and the corner between it and Route 10 belonged to it instead of belonging to Route 10 as it does in Generation I and III, making the north entrance to the Rock Tunnel placed practically in this route by three steps. Interestingly, the only way to enter the cave is entering Route 10 as the half of the Pokémon Center blocks the way. Also, almost all items were removed from the route and the number of Trainers was reduced to six. However, five of the six remained in positions occupied by Trainers in the other Generations.