you ether need a Nintendo wifi usb connector or a wireless router.
No.
If you have a Wireless Router then yes, you can use a Wireless Router for accessing Wi-Fi features in Pokémon Diamond but if you are without a Wireless Router then you need to get either that or Nintendo's Wi-Fi USB Connector which will help you connect your DS to Wi-Fi features for Pokémon Diamond.
Yes, if you have a wireless router and connected your DS to it, you can.
You can't, you need the CD.
Go to www.serebii.net to find a list.
wireless adapter, mystery gift option, and a person who has Pokemon emerald
The question is a bit unclear, you can only connect to the internet wirelessly, and you need a wi-fi network in range.If you don't have a wireless router, you can:get a USB Nintendo Wi-Fi Connector (or similar device)use someone else's wireless network (in most cases this isn't allowed, and is probably password protected)Find a Wi-Fi Hotspot (Try public places like McDonalds)
By attending a Nintendo of America Event. You can also use an Action Replay/Gameshark.
You can't
you trade with someone who has done so through via wireless or Pokemon GTS, GLOBAL TRADE STATION
Yes using the Wireless connection for the DS or Nintendo wifi connection.