By Nintendo events they are real Pokemon but by. Nintenods view of them they don't exist yet but many people have them i even have one they are Darkrai Shaymin and Arceus
Mewthree cannot be caught in Pokemon Diamond, even with an Action Replay, because it does not exist in the game's data.
To answer your question, Birth Island doesn't exist in DPP.
If you want to catch a Pokémon called Apalmin you will have a hard time. This is because such a Pokémon does not exist in Pokemon Diamond.
yes, you can catch Pokemon in Pokemon diamond
You cannot catch Celebi in Pokemon Diamond.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
You can catch makuhita in the fighting area in Pokemon diamond
How do you get a cherrim in Pokemon diamond.
ucant catch misdreavus in diamond
You cannot catch a Metang in Pokemon Diamond. To get one, you can evolve a Beldum.
You can't catch a Lugia anywhere in Pokemon Diamond.
Nosepass is a swarm Pokemon on Pokemon diamond