You have to see every Pokemon in sinnoh and then go to professor rowans lab and then he will congratulate you. Then professor Oak comes in and gives you the national pokedex also letting you go to pal park
You just need to at least see all the Pokemon that are in the normal Sinnoh Dex 1st, then when you have done all that and have seen them all, go back to the professor, and he will enable the National Dex. No that's wrong you have to catch at least 60 Pokemon then talk to prof rowan he will then give it to you.
There are 210 in the Sinnoh Dex, 493 in the National Dex {including EVENT Pokemon}
The last Pokemon on the national dex is Arceus.
Piplup's National Dex number is 393.
omg ditto is only in the national dex noob :) omg ditto is only in the national dex noob :)
In Pokemon Platinum to get the National Dex you will need to have seen all 210 Pokemon in the Sinnoh Dex then talk to Professor Rowan and then after a while Professor Oak will give you the National Dex!
talk to oak in eterna city and he will give you the national dex
Capture all the Pokemon On the National Dex.
You get the National Dex as soon as you start the online game.
You complete the shinho dex first and then you get the national pokedex
no. i tried
there is no national dex in Pokemon emerald. but, you can trade it from Pokemon leafgreen, and firered.