PALKIA. You go to the town elder in Celestic town, her house is the big one at the back and she shows a picture of it to you when you've got DIALGA
Palkia but sadly you cant get palkia in diamond but there is an old lady in a town to the north that will show you it and it will be complete.
See all 150 Pokemon in the Sinnoh Dex and talk to Professor Rowan.
No all you have to do is SEE the first 150 Pokemon then you shall get the national dex..
The Pokemon that is number two in the National Pokedex is ivysaur.
the Pokemon is rotom to get him you need to trade it over from diamond pearl or platinum
102 is chatot
150
Pokemon number 150 is Palkia, you can get it on the pokedex by trading, battle a friend or seeing the old lady in the library who shows you a picture of Palkia which is then added to your pokedex.
Pokemon Number 149 (Dialga) Cannot be found in Pokemon Pearl, he is only available in Pokemon Diamond, where as Number 150 (Paulkia) cannot be found in Pokemon Diamond. If you need to fill the spot to complete the PokeDex, you can see #149 from a lady in Celestic Town.
in the grate marsh
there are exactly 493 pokemon, i know!
Riolu
Oddish is the 43rd Pokemon.
In the National Dex, Mewtwo is Pokemon number 150.
diamond pokedex number 80 is Barboach
you have to see 150 Pokemon then talk to professor oak..
for diamond and pearl there are 150 Pokemon u need to see . in plat nium u neeed to see 210 Pokemon.
Number 46 is Paras.