In Route 209 Lost Tower and Turnback Cave.
You can catch Duskull in Pokemon Platinum by going to the Lost Tower that is near Solaceon Town however you can only find it at night.
Turnback cave.
It is very rare but you can catch it at mount Pyre.
On route 224 with the pokéradar.
Use PokeRadar on Route 224. There is a 2% chance and the Duskull will be level 23.
route 224, found with Pokemon radar. AT NIGHT!
Pokeradar on Route 224. It's easier just to catch Duskull in the Lost Tower at Night in Platinum. (Duskull don't appear there in D/P, only Platinum.)
Route 224 Poke Radar
After you catch giritina youll come to spring field and it will be there in the grass!
You can get Duskull by using the Pokeradar on Route 224 in Pokemon Diamond. You must use the Pokeradar at night in order to find and catch Duskull.
after u find it on its island it roams shinno
you have to catch a duskull on route 224 and raise him to get dusclops