no, you need to see all the Pokemon native to the shinnoh region including both palkia and dialga, and the trio. and you can get phione you just breed manphy if you go to the trophy garden on route 212 go to mr. backlot's office on the table behind him there is a book it has manphys details in it then go to jubilife city and go to the global terminal and get manphy and breed it with a ditto if you don't have ditto get it from emerald or ruby or sapphire and there you go hope this helps
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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!
Not really. You can still get Oak's Letter without it, but to get TO route 224, you need to beat the E4 and have the National dex.
No you need the national dex.
Yes.
No. It's part of the Sinnoh dex.