catch them (read the instruction booklet)
You can buy Pokemon Diamond at EB games and Game. Any game shop.
none of them
Not that i know of. i dont think there is any.
You can't. There is no such thing in any legit version of Diamond or Pearl.
You can't, because Pokemon black was made after Pokemon diamond, Pokemon diamond wouldn't be able to recognise any of the new Pokemon. So to solve this problem they stopped all trading from black to any other game apart from white. You can however get your Pokemon from diamond to black by using the poke transfer, yet you need to have won the league for the first time to be able to do this.
There isn't any
No, there are no other regions in Pokemon Diamond.
buy a action replay or cheat cartridge with Pokemon diamond on it
No
Umm... sorry if this sounds rude, but of course there are Pokemon in Pokemon Diamond! It's one of the Pokemon games!
There is no Lumineon in diamond
Any Pokemon (includingWailord and Azelf).
I don't think there is!
You can buy Pokemon Diamond at EB games and Game. Any game shop.
Yes.
No there isn't!
there aren't any.