you cant
No.
you cant get it without migrating.
You can get Poochyena into your Pokemon Diamond by migrating it from a Sapphire, Ruby, or Emerald Pokemon game.
First you have to catch all of the Pokemon in the world including all the rejis. then you have to watch the news and see if there is a rare Pokemon siting then you go to where it said it was sited.
yes.
use action replay
you can get a plusle in diamond by migrating it from like emerald or something like that
You Can keep playing the game but not with the Pokemon you migrated
No. Migrating is when u put a GBA Pokemon game in the GBA slot and get it in diamond thru the pal park. Trading u get a Pokemon from another trainer.
Near Hearthome city.
You can only get the petaya berry in Pokemon Colosseum, so the only way to get it on diamond is cheating or migrating.
YOU CAN'T GET CELEBI IN DIAMOND WITOUT MIGRATING