If you mean on you Sinnoh Pokedex, then you can't. You'll need to trade in order to get another starter.
If you mean on your National Pokede, then you can't. You'll need Pokemon Ruby, Emerald, and Sapphire (Game Boy games) to help and you'll have to attend several Mystery Gift events. Once you have it, put the game boy games in your slot in the DS, and go to route 221, and go to the end. You'll have to transfer Pokemon and then catch them again in a game like the Safari place.
u get national dex
Yes if you want to finish the Sinnoh and the National. You have to see it and obtain the Pokemon info
ucant catch misdreavus in diamond
No all you have to do is SEE the first 150 Pokemon then you shall get the national dex..
you've gotta be crazy if you think someones gonna write all the Pokemon you can catch in diamond
To catch every Pokemon, you need action replay for the few last diamond legendaries. You will need Pokemon fire red/leaf green and emerald. Migrate them to Pokemon diamond. In Pokemon diamond, fill up your pokedex by catching Pokemon normally or with poke radar, or use gts. It will take a long time to catch all Pokemon
No not every pokemon. You can't catch the starter Pokemon and many of the rare pokemon, you have to trade with Diamond. sorry ...
To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
you don't, you migrate it from Pokemon ranger, have fun on you're game, I can catch every Pokemon exept mew.
you cant
you cant you get it from Pokemon diamond or pearl to get it you need to catch every pokem and get the azure flute
yes, you can catch Pokemon in Pokemon diamond
You cannot catch Celebi in Pokemon Diamond.
The Great Marsh. Check every day.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
You can catch makuhita in the fighting area in Pokemon diamond
u get national dex