I did a pretty thorough  search of the forums of this idea had already been thought of but I couldn't find it, so excuse me if it has been thought of already.

So my idea is having PVP faction vs faction quests.

For example quest: Team Rocket vs Police department:
both factions need 2 or 3 players and get opposing quests. something like team rocket needs to rob a bank and the police people have to try and stop them through competing in puzzles, poke battles (obviously) and anything else you can come up with.

I could name many more examples but I'll first see if it has been thought of already and whether people like it.
So let me know what you think and whether it's even possible.