You don`t have to but if you don`t you can`t transfer Pokemon from Pokemon diamond or pearl but if you have a ds you can transfer or battle on the big screen.
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You need a wifi router or a Nintendo wifi usb
no,you dont.actually you need a WII to play it.
yes but you have to own two DS's and the games UPDATE: You also need Pokemon Battle Revolution
lets see they need 50 Pokemon balls
Sadly, you are unable to, You will need to 'transer' the pokemon from the GBA game in the Nintendo DS fat/lite.