I know that you can have different battle backgrounds depending on if you're in a cave, surfing, on land anywhere, in a building, etc. What I'm proposing is a different background for each "on land" area - for example, routes with piers such as 26, 27 and 12 could have you battle on a pier surrounded by water. This'd create more of a feel of battling in the area you are exploring in than the current one. It could also be implemented for fishing, as it currently uses the same area wherever you fish.