Item clause isn't going to stop any of those things from happening. There's no point in using it other than to annoy people. PBR doesn't have it as standard, BTW.OMG Aero said:Oh, I got mistaken about the species clause since you said Wiseblade could have two Pikachus.
Also I'm pretty sure Stadium, Colosseum and Battle Revolution use the item clause as standard and Nintendo usually uses them in their tournaments.
I find that the item clause makes matches less boring since usually people just use 6 sets of leftovers or put focus band/sashes on everything.