you have to put friend code's in your pal pad first.
Yup.
First you have to have wifi. If you do than you have to beat the game and go to the fight area. then go to the right for a while than go to the battle tower and chose battle using wifi.
in jubilve city
yes
you cant. in the beginning when u need to fight a starly, choose piplup. it will evolve in prinplup. if you have chosen an other pokemon, then u can only get it with WiFi.
because you need better wifi
Via Nintendo Wifi.
In Jublife City
you just can't
its the card that enables you to use the wifi station in jublife city.
either by cheating or a wifi event (but wifi event expired)
Of course you can. I played my Pokemon Diamond with my cousin that has Pearl.