>>33774825Well in Smogons viability rankings Dusknoir is rated B+ while Dusclops is rated C . If you want reasons why Dusknoir is better, heres a list:
1. Knock Off renders Dusclops useless and it becomes deadweight afterwards
>hurr just switch outNothing in PU appreciates switching into Knock Off
2. Dusclops has no offensive presence whatsoever and is easy set-up-fodder for Special Sweepers, Pokemon carrying Substitute or Pokemon with Guts as their ability
3. Z-moves: Stallers like Dusclops have it harder than ever since every Pokemon has access to a super-effective nuke which can heavily dent or outright OHKO Dusclops even with its boosted defenses.
To be clear here, both suck in battle and there are way better Ghost types out there. Since Generation 6 Dusknoir is the better Pokemon of the two.