enter a Pokemon center and go upstairs. right next to the globe, you'll see a woman. talk to her and chose what you wanna do, global trade, wifi battle, you'll see and understand by yourself. hope i helped :)
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Yes it is possible but it is not possible to battle people with ds from your computer and i prefer pokemon gold not silver
You need a wifi router or a Nintendo wifi usb
No trainers have Manaphy. You get it by wifi event or pokemon ranger.
you use the c gear when you are by a friend or over WiFi then you can set up one survey question at a time
You can trade, battle, and have voice chats with your friends over Wifi in Pokemon Diamond/Pearl, but to do so you need to know your friends' Friend Codes, and your friends need to know your Friend Code.