Standard battle transition is not the best match since it zooms in everything OTHER than the map by how it works. Thankfully it doesn't have any issues with alternative transition plugins so if that is something you would like to do you can do so for an extra touch. As for the background, I think it would require a little more information to make a call on that.
EDIT: Just remembered that since it is the world map that you're talking about, that is generally supposed to change based on terrain so long as it is set to entry one in your tileset list. Unless of course you wish to override this within the event as a change battleback call.