You can evolve Dusclops by trading it to someone while it's holding a Reaper Cloth and it will evolve into a Dusknoir.
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you give it the reaper cloth then i think you trade it.
You give it to Dusclops and trade it and it will evolve into Dusknoir.
Duskull evolves into Dusclops at level 37.
It evolves to Dusclops at level 37. Note that you can't evolve Dusclops further into Dusknoir in this game, because Dusknoir wasn't introduced until the 4th generation games (Diamond/Pearl/Platinum).
When a dusclops holds the reaper cloth and gets traded to Pokemon platinum diamond or pearl it will evolve to dusknoir