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).
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sky pillar or evolve a duskull
you evolve a duskull at lvl 37 one of the best ghost Pokemon on emerald
lvl 37
Duskull evolves into Dusclops at level 37.
30.