Familiar Faces at the Battle Tree

I had made it to the Battle Tree, my team weary from the ordeal of getting there, when a couple of Trainers approach me, saying they were Kanto region Champions in the past and allowed me to fight one of them. I chose the one who didn't (couldn't?) speak. There's nothing more exciting in a Pokemon game than the following words. "Pokemon Trainer Red would like to battle!" This is the exact same Red, with the exact same team that he fought Fluttershy with in Ponymon Girls! Now I'm wondering if anyone actually chooses to fight Blue, his rival, and the other trainer that you meet with him.