no,you dont.actually you need a WII to play it.
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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.
you need a emulator, which one you need depends on the pokemon game you want to play
you still can play just battle wild Pokemon ;) hope this helps
Yes,if you play with your mates. If you enter official leagues i'm not sure
You need action replay