You go to Sandgem town then you go to Professor Rowan's Pokemon Research Lab.You have to talk to him and then Professor Oak will come in and he will give you the National Pokedex (But first you needed to have finish the Sinnoh Pokedex.)
P.S When you talk to Professor Rowan he will give you the Pokeradar.
In the National Pokedex, it is Tentacool. Should be the same for Platinum.
there is no number 211 in platinum pokedex. no. 211 in national pokedex is Quilfish.
complete the normal pokedex
No.
You do not need the national pokedex in platinum, simply talk to Bebe in Hearthome city
in the national pokedex, it is chikorita, and in the sinnoh pokedex, it is rotom
That pokemon is Azumarill in pokemon platinum in the national pokedex
in the sinnoh pokedex dusclops, in national pokedex aipom
in the national pokedex it is flareon which i have finished the national pokedex in the first pokedex it is tentacool in platnium
nothing
Umbreon is for the national Pokedex, and Elekid is #197 in the Sinnoh Pokedex.
For the Sinnoh Pokedex: Rotom For the National Pokedex: Chikorita