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talk to everyone in the whole game to get a groundon.
It is imposible without an Action Replay unless you get it in a GBA game and transfer it to Diamond/Pearl throu pal park.
find them yourself.
if its diamond and pearl,yes.otherwise,no.
If you are done the national dex then good for you you have completed the whole game.
Dialga is found in Pokemon diamond. although he can only be caught once (unless you restart the whole game again!) How do i know because i have Pokemon diamond, pearl, platinum and heart gold.
The truth is that you have to go throw the whole game and see all of the Pokemon in battles or catch them. Then you get the national Dex and migrate from the GBA game.
It is very true i beat the whole game!
there isn't a Pokemon ranch on Pokemon diamond, its a complete other game! there isn't a Pokemon ranch on Pokemon diamond, its a complete other game!
You can not buy Pokemon from the game corner in Pokemon diamond, but you can in heartgold and soulsilver
Alamos Town does not appear in the Pokemon Diamond version of this game. It is in the movie, but not on this game.