You get the national dex when you beat Cynthia. And get the poke dex at Rowan's lab.
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It is Tangela.
in an egg.don't listen to that rubbish answer look on the poke dex
the poke radar isn't an app it is a key item, i think you get from prof rowan after completing the national dex
go to the radio on wedsdays and got to the places where the poke dex says hoenn pokemons are
Get the national dex and transfer from ruby, sapphire, or emerald or in Mt. Coronet on the snowy area by using the Poke Radar