National Dex?

[UmbreonCurse]

Right, so I'm well aware that after the elite four you can't do much in Diamond and Pearl without first getting the National Dex. The problem is that I've seen all but one poemon for the Sinnoh dex, that one being Plaklia which, being exclusive to Pearl I can't get.
Is the only way to get the national dex by trading, or is there some way a Wi-Fi less person can get the National without trading cross country?

[Shadow Wolf]

I can answer that.

All you have to do is fly to Celestic Town and head to the big house in the north side.

There, you should find the old lady who talked to you about the legendary pokemon.

Talk to her and she will show you a picture of Palkia(Dialga if its Pokemon Pearl)

And Voila!, your Pokedex is complete.

[Blademaster]

Go back to Celestic Town and talk to the Elder; she'll show you a picture of Palkia that your Sinnoh Dex will then record as 'seeing' Palkia.

[UmbreonCurse]

My extremely grateful thanks.

[Shadow Wolf]

No problemo! ^_^

...and if you have another doubt, then be sure to ask here, as we are able to help anytime.

OK, time to run.

*flees*