I doubt that the trainer there from the opening is going to play a big role, let alone be a rival. He looks kind of generic in his design and I think he was just thrown in for a battle in the opening. I'm also starting to doubt that Ash will have a main rival in this series given that we heard about Paul and Trip before DP and BW started. I'd be fine with that to be honest. In my opinion, they need to take a break from writing rivals for Ash.