I don’t think this was available in America but on my European version, I was able to go online and download specific battles against a CPU character. The CPU character always talked before the battle so I am looking for the list of of conversations. Sakura and Karin said something like “You didn’t expect this, did you!?” “Two against one is much more fun!” and in a battle against Dan, Dan says how he would take things more seriously this time.
Its been a long time now, I doubt anyone actually bothered to record these. But if anyone did, this would be the place to ask.