The credit of this post goes all to the users Surgo and Xenesis:
Surgo: "The games can be compatible online while having glitches fixed. This must be the third time I've posted this...
In the Japanese version of Pokemon Diamond & Pearl, if you are holding a choice band (or other choice item) and kill a pokemon that switches out against you with Pursuit, you can change your move. This "glitch" does not exist in the American version, but you can still play with the Japanese versions online. This is where my memory gets fuzzy, but if I recall correctly both games will behave in their own way when playing online (so the Japanese player has the advantage)."
Xenesis reply: "That's incorrect. The rules of the US version take priority over the Japanese version. That being said, if two Jpn versions are playing then it works like the Jpn version."
That being said, it's possible that something like this can happen in Brawl, with the US version taking priority over the Japanese one, so there is no need for you to be sarcastic.. I have no idea if there are differences between the different versions of Brawl, I'm discussing the possibilities. And Demon_machinE, a little politeness goes a long way you know? If you have nothing to discuss, then please just shut up.