Interesting is that the name of Aoba, can mean green leaves or blue leaves and its rival Momiji means deep red leaves. The first pokemon games when they came out in Japan were called Pokemon Green and Pokemon Red, but when they adapted it to the west they were called Pokemon Blue and Pokemon Red. Here there is a slight difference the protagonist of the games is Red, it does not matter which side you see. Red and Green / Blue are rivals just like Aoba and Momiji