How do you get sable eye in Pokemon diamond?

To obtain a Sableye in Pokemon Diamond, you will need either a Diamond version or a Pearl version of the game. Sableye is a version exclusive Pokemon in the 4th generation of Pokemon.

- In Pokemon Diamond:

1. Head to the Eterna Forest.

2. Within the forest, you'll find patches of tall grass. These patches are where wild Pokemon can be found.

3. Enter one of the tall grass patches.

4. A wild Pokemon encounter will begin. Random Pokemon will appear based on the area you are in.

5. Keep battling or running from wild Pokemon until you encounter a Sableye. Sableye has a relatively low encounter rate, so it may take some time.

6. Once you encounter a Sableye, you can attempt to catch it by using a Pokeball.

- In Pokemon Pearl:

Sableye is not a Pokemon that is available in the Pokemon Pearl version of the game. You will not be able to find a Sableye in the wild or obtain it through any other means within Pokemon Pearl.