I would LOVE them to add this feature to the game! One of the rules I can see being in place...You can't use the same pet more than once in a team. This would stop some of those cheesy pet comps you see in PvP!
It would be cool to have an area where Pet Battle folks can meet, and battle each other too. Like an arena, but just for Pet PvPers
I'm surprised how many people on the forums here, don't PvP and like the PvE elements of the Pet Battle system. PvE is good and all, but the system is made for PvP in my eyes, and people are missing out on what makes the Pet Battle system so much fun!
Anyway, I would love to see Blizzard add a World PvP Battle Tournament, but I'm not counting my chickens just yet. Blizzard is lazy, and they won't put the effort into making the Tournament