this is not true until you get the national pokedex... wl actually you cannot catch all the Pokemon but you can download or "migrate" as Nintendo say it onto diamond just by pluging in either pkmn fire red, leaf green, emerald, Sapphire or ruby using pal park.
you also sometimes have to trade with people on another ds console, probably if they had pearl it would be best coz if you want palkia it is not available on diamod and you have to get it from pearl. the best way to get giratina also is to trade him from platinum so you don't need to get national dex yet to unlock wayward passage and wayward cave. i am a real nerd at Pokemon lol :)
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Pokemon diamond
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
The weakest Pokemon in diamond is a magikarp. It is also the weakest of all the Pokemon existed. Magikarp is weak but it will evolve to a mighty gyarados.
you have to see all the Pokemon in the pokedeks
no way