No, you need their friend code.
UNLESS, you are in the Battle Tower doing a Wifi tournament. That's the only way without friend codes.
Unfortunantly, you can't play Pokemon diamond on the computer yet. But you can play all of the Pokemon versions for the gameboy color online.
HAHAHHHA , you play pokemon.
juego Pokemon
just play until you are boerd.
yes.
because it's to old and besides there are better games out there in the world like Pokemon diamond and pearl
well.............. after you finish diamond it kinda gets boring for most people but if you still want to play you can fill up your Pokemon and train them so baisicaly you can do watever you want :)]
easy just dont play the game
i dnt no get a life if you play Pokemon
no
U can't
No way that I know of.