yes you have to migrate
You try to fill up your pokedex so you can get the national dex. When your done with that then you try to fill the natonal dex by migrating Pokemon to pal park. There are alot of legendaries that you can only get after you get the national dex
try and fill the national dex
sometimes there will be swarms after you get the national dex.
fill up sinnoh Dex and go to the Professor and Oak will come and upgrade your Dex
well you need to fill all your sinnoh dex then talk to rowin and this guy (Oak) he will upgrade your dex then you have the national dex.... hope that helps, Tina :D
get a action replay
The first pokemon in the national dex is bulbasaur, which can only be obtained by trading, or by migrating from gameboy.
Capture all pokemons.
i got mine from migrating it from leaf green but after u get the national dex u can get it from the saferi zone
Pal park, migrating from Ruby/Sapphire/Emerald after obtaining national dex
The Pokemon you can get before the national dex is Dialga, Mesprit, Azelf, and Uxie. After the national dex is Giratina, Cresselia, Regigas, and Heatran. With mystery gift is Shaymin, Arceus, and Darkrai. You can get other legendary Pokemon by migrating/trading.
Yes, you do need the National Dex in "Pokémon Diamond" in order for the Gameboy Advance Game Pak Pokémon Insertion method to activate. Not only that but the Pokemon your migrating must not have HM moves and you must migrate 6 Pokemon and diamond must have the national dex as well.