How do you catch Dialga in Pokemon Diamond?

You can't catch Dialga in Pokemon Diamond! Dialga is exclusive to Pokemon Pearl, just as Palkia is exclusive to Diamond.

Here's how you can get Dialga:

* Trade: The easiest way to obtain Dialga is to trade with someone who has Pokemon Pearl.

* Event Distribution: Occasionally, Nintendo may offer Dialga through an event, but these are rare and typically limited time occurrences.

Remember, you cannot catch Dialga in Pokemon Diamond.