you have to catch all of the pokemon in diamond or SEE all of the pokemon
well you need to have all your Pokemon in your pokedex and when you get your national pokedex you will get breed
if you meen the national dex then you need to find every Pokemon in the sinnoh pokedex
you can't find metang in Pokemon diamond you have to get beldum in swarm when you get the national pokedex and then evolve it
IN Pokemon platinum you find this Pokemon on route 201(after you get the national pokedex you put fire red version into your DS)and he will appear.Samething with Pokemon pearl and diamond.
The Pokemon league cave (after obtaining national pokedex) i am not sure The Pokemon league cave (after obtaining national pokedex) i am not sure The Pokemon league cave (after obtaining national pokedex) i am not sure
in the sinnoh pokedex its unown, you find it ONLY in solaceon ruins. in the national dex, its Tangela.
you trade a Pokemon from a friend(not gts place)
You have to have the national pokedex, because you cant find a lot more Pokemon without it. :)
you can only find it on pearl but you can trade with a friend that has Pokemon pearl you can possibly find it when you obtain your national pokedex i might be wrong. :} For people who have diamond,if you know where to find murkrow,then you know where to find misdreavus in Pokemon pearl,you don't need the national pokedex but you can trade Hope you find this info helpful
To get Breloom in Pokemon Diamond you need to evolve a Shroomish. Shroomish can be found in the Great Marsh after you obtain the National Pokedex.
In the National Pokedex in Pokémon Diamond number 485 is the Pokémon Heatran. He can be found in the volcanic caves of the region.
bebe gives you an eevee after you have the national pokedex and have beat the elite four