Yes, yes you do.
yes if u have a Pokemon pearl or diamond trade the Pokemon from the palpark then get another ds put pearl or diamond in then the platinum in the other ds and trade at the Pokemon center at the top
Transfer it from your bottom game or get it from a Pokemon event. Pokemon events are under Wifi Conection but they don't happen often.
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.
No you do not need wifi to go into the underground tunnles but you can use ds to ds action and play with your friends in the underground and trade and stuff.
you have to go onto the home page thing that says start game/ new game/ wifi. you go in to wifi and put in your wifi code.
Pokemon events allow you download gifts through wifi onto your pokemon game.
to get mystery gifts you have to go to events on Nintendo wifi if you have already got a mystery gift in game then go to a pokemart
game stop
Yes you do.
Of course you can. I played my Pokemon Diamond with my cousin that has Pearl.
check wifi
you have to have wifi connection to enter
6.
There is no Starbuck's in Pokemon. What you are refering to is the fact that you get WiFi connection in Starbuck's Coffee. It is not in-game. Real-life Starbuck's has access to WiFi.
get mystrey gift.and get from ither a friend wifi or wfc
try using wifi