After beating the Elite Four, somewhere in the Survival Area at night. Or catch a Dusclops at Sendoff Spring and breed it.
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Duskull evolves into Dusclops at level 37.
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.
lost tower at night
You can find Duskull on Route 224. :)
You can find a Duskull in the Safari Zone.