I guess it depends on what Gen 6 has to offer. If there are multiple side quest that involve Pokemon battles/growth then sure why not? If not then no. I don't even want him as a rival. The anime can only make certain kinds of rivals and I imagine the rival spot would hurt the boy's image and thus kids won't want to play as him if he's a jerk. And he'll be annoying if he's the "idiotic punching bag" rival. So the rival spot he just can't win. Really the only rivals we get are serious jerks, boring friendly goodie goodies, idiotic punching bags, or serious punching bags. Sometimes we get something different but not always.
Parena or Serecham both equal Serena+Pancham!