You can't! You either use a Gameboy Advanced SP or the Gameboy Advanced. Lo siento.
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.
yes with wireless adapters or a link cable
You can get Teddiursa in The Altering Cave on Outcast Island if you have your wireless adaptor connected. Or trade from Emerald using the wireless adapter.
You would have to get it from firered or leafgreen the cool about firered and leafgreen is each can purchase the TM Dig at the Celadon City Dept Store then they can trade the TM to Emerald remember to trade between emerald and leafgreen or firered you must use wireless adapters.
In firered, it is in the powerplant, but you can't get them in leafgreen. You have to trade it from firered.
Bellsprout has to be found wild, in leafgreen, you need to trade from Leafgreen for Pokemon.
No one in the game trades you rattata nor pidgey if you want to trade those Pokemon use a link cable or wireless adapter to trade with leafgreen or another firered.
At least 2 badges are needed to trade from leafgreen to firered.
You must trade pinsir from leafgreen to firered.
Slowpoke is not in firered only leafgreen can get it trade one to firered to get it.
Vulpix is an exclusive pokemon to Leafgreen version if you trade one from Leafgreen to Firered you will be able to have it.
Poliwhirl is not obtainable in leafgreen trade one from firered.