Where do you find misdreavus in Pokemon Diamond?

A Misdreavus can not be captured in Pokemon Diamond. However, you can trade for one or check the following places in Pokemon Pearl if you have it:

Lost Tower - Floors 1-5 at night.

To get to the Lost Tower, take a right just before reaching Solacean City.

Eterna Forest - Normally close to the trees (only appears at night).

To get to Eterna Forest, follow the path north east of Floaroma Town or go west from Eterna City.

Note:

Be sure to take plenty of Pokeballs or a Pokeball with a high catch rate. Misdreavus tends to be good at escaping. You may also have to walk around for a bit, they tend to be pretty shy. I averaged about one Misdreavus every four or five fights.

Evolving Misdreavus into Mismaigus:

You can use a Dusk Stone to evolve Misdreavus into Mismaigus. A Dusk Stone can be obtained from the Warehouse in Veilstone City. You must have the Warehouse Key to enter it. The Dusk Stone can be found behind the door.

MIsdreavus is in Pokemon diamond go south of veilstone and the first dude you fight he has a misdreavus