True but this is something much much more then a visual change and such. This is a key feature that no ever thought would be seen again. People seeing this would go oh wow you can travel with your starter! and think well this will be an interesting journey. The snow thing was just an excuse for the new outfits. And sinnoh was colder. Just lets say somehow pollution didn't allow the snow to freeze over the cities.Probably for the same reason they made a deal about how Sinnoh was colder in Platinum then only had a scratty bit of snow in and around Twinleaf Town. Small things get people excited. I certainly know i was expecting more visual difference in Sinnoh in Platinum but turns out it was just an excuse to give Dawn/Lucas an outfit change.