try amazon or eBay probelly a pawn shop or flea market
You can use a wired adaptor if you're using a game boy advance.
No. You might be able to find an adapter, but the Game Boy is old enough, you probably wont find anything
You need to buy a link cable designed for Game Boy micro.
No, GBA games in a DS can't use the DS's wireless functions at all. That's even if it's a game that did have wireless capabilities through the GBA wireless adaptor, such as FireRed and LeafGreen.
first you will need a link cable or a wireless adaptor (only emerald, leaf green and fire red works with wireless)... then go upstairs at any pokecenter... go into the trade room (union room if using wireless) and trade there
no they they are not wireless
No, the GBA games cannot use the console's wireless capability, even if they are games that did work with the GBA wireless adaptor. You will need to use actual GBA consoles to do it, as well as a link cable or two GBA wireless adaptors.
it should be able to with a wireless adapter
No, the GBA slot of a DS is unable to use the wireless capabilities of the DS. You cannot link two DS's together to use the GBA part of the consoles. To do so, you must use actual GBAs and a link cable/GBA wireless adaptor.
You can't! Also, it's called a NINTENDO D.S. It's not a Game Boy.
no
yes because its the wireless internet.