get an action replay then get the "poke mod" otherwise known as Pokemon modifier
and then find all the Pokemon.
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.
In Pokemon Diamond, Pearl, and Platinum you can find Buneary in the Enterna forest.
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
you have to see 150 Pokemon then talk to professor oak..