How do you change the encounter type? At the moment, I'm mapping a cave, but for fairly important plot related reasons, there is grass inside the cave, and rather than have battles possibly activate on any step, a la ordinary caves, I only want the possibility for battles to activate on steps within grass, just like any normal route. I thought you could do this by going to Advance Map, going to the Map Header, going to Map Options, and selecting the option "Route" under the drop-down list named "Type", but this seems to have had absolutely no effect, and Pokemon still appear on any step as though it was a cave.