No. It doesn't make sense that Arceus should be banned on principle. Who sets this general consensus? That is exactly the problem with Obi's post and with all the little kids that flip out at the mention of Action Replay. People can claim that the "general consensus" is that you don't use any legendaries (this is true amongst a lot of casual players), or that sleep moves aren't fair, or that using one Uber per team is ok, or whatever other arbitrary rule they want to tack on. Everyone can have their own idea how to play and CLAIM that's the general consensus and everyone should abide by it, but not everyone plays Smogon-style pokemon, even people who visit this site all the time don't necessarily agree with the standards set by Shoddy. Unless those rules are set in advance, there's no reason to expect opponents to abide by them.
Over 10 million people bought a copy of Pokemon Diamond/Pearl and most of them are casual players, which makes Smogon-style battling the minority view. So "rule of thumb," "general consensus," or whatever else you want to call it, are terrible ways to assume battles are going to run. You can't assume that your opponent knows these things because the overwhelming majority of Pokemon players don't agree with your view of the game.
So frankly, its stupid to assume that you opponent automatically knows what you THINK the rules should be. If you don't communicate your expectations beforehand, its silly to expect the other person to know what you expect. Otherwise, they either have no idea that they are offending you, or see the ambiguous rules as a free pass to play how they want to. Either way, its your fault if you don't communicate beforehand.
Just talk to each other beforehand. If you're setting up a battle on Wifi, then you clearly have the ability to do so. Then everyone wins and there's no need to get angry.
