With a pokeball*! [Boom boom tish!] Thank you; I'll be here all week!
Duskull is most common at the top of Mount Pyre, typically coming hand-in-hand with Shuppet - not inside the graveyard tower, but the grass along the mountain itself - to find the mountainside, simply Surf to the entrance of Mt. Pyre (Route 122, just below Lilycove) but don't follow the stairs to the upper levels. To the West of the ground level there is a door that leads outside - this is also the place where the Blue and Red orbs sit (the summit).
Vulpix and Chimecho can also be caught here.
*(And FYI: Duskull usually appear in the low- to mid-twenties level, so I would recommend use of a Great Ball.)
to get duskull, go to the top of mt. pyre and search throgh the grass. you might find chimeco too.
Try looking to your right as you enter the Haunted House. That Duskull will befriend you after a game of chase!
in the grass to the west of lilycove
Duskull is uncommon, not rare but its better to catch it if you don't have one
on the moon
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.)
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.
It is very rare but you can catch it at mount Pyre.
Use PokeRadar on Route 224. There is a 2% chance and the Duskull will be level 23.
Turnback cave.
On route 224 with the pokéradar.
After you catch giritina youll come to spring field and it will be there in the grass!
Route 224 Poke Radar
you have to catch a duskull on route 224 and raise him to get dusclops
in the shaymin area you can mostly catch him at night..