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!
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In Platinum dex' its Dusknoir in National dex' its Sunkern.
in sinnoh dex it is togetic but in national dex it is igglybuff
In the sinnoh dex: porygon In the national dex: sunflora
go and see all the Pokemon in the sinnoh dex
National Dex: Igglybuff Sinnoh Dex: Togetic