You need to battle every trainer in the game. * Unown is not owned by any trainer. It can be found at the cave east of Soleacon Town. * You may not have battled the trainer with Drifloon in Hearthome Gym. If not, see (and possibly catch) one every Friday at the Valley Windworks.
you have to catch all of the pokemon in diamond or SEE all of the pokemon
The only way you can see all the Pokemon on diamond is by going into the GTS and global trade different Pokemon.
you have to see all the Pokemon in sinnoh.
you have to see all the Pokemon in the pokedeks
You just need to SEE all the pokemon.
No, you cannot see every Pokémon in the National Dex in Pokémon Diamond however you can see every Pokémon in the regional Sinnoh Dex in Pokémon Diamond.
u have to go to the battle park
the Pokemon in diamond are sinnoh Pokemon i suggest http://Pokemon.marriland.com/diamond_pearl/pokedex to see all of them
there are 150 kinds of Pokemon that you can see and/or obtain. Unless you have friend trade you Pokemon that you can only get in pearl to you, you'll never obtain them all. In Pokemon diamond and pearl all you have to do is see the Pokemon and you get its data unlike the older versions where you have to obtain them.
you have to see all the Pokemon on the sinodex then prof rowan gives it to you
all u need is the national pokedex in pearl or diamond to import them u must have it
you have to get the national dex when you see all 150 Pokemon orif you play platinum you will have to see all 210 Pokemon