You need to beat the game. And then professor birch is going to give you national when you talk to him. Ignore the previous answer.
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200 Pokemon is all the emerald Pokemon to get more beat elite four and get national dex
You have to migrate six Pokemon from ruby, sapphire, or emerald in order to get into pal park. (after the national dex) Get the national dex. (before the national dex)
You need the National dex, and then there is a new part of the Safari Zone He will be there.
you cant munchlax is knew on the Pokemon diamond and pearl national dex.