You can't
You cant use hack Pokemon on a wi-fi battle.
Yes you do need a friend code to battle on wifi
you would have to register someone in your pal pad then go to basement of Pokemon center
Wi-Fi. (Of course.)
Yes, you can battle people without using WiFi by using either IR Connection or DS Wireless Communications.
Depends on whether or not you're in the Battle Frontier.
yes you can honest truth
Any except eggs and glitch pokemon.
they either caught it on a Pokemon ds game / hacked it and copied it onto the Pokemon battle revolution and used it on wifi. its possible
yes
You have to get Pokemon Battle Revolution and defeat the stargazer colluseeum and you can trasfer them to your diamon/pearl versions using Nintendo Wi-Fi
you have to use three Pokemon in Single Battle two in Multi Battle four in Double Battle three in Wi-Fi Battle