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It has a very nice typing - one weakness. I'd imagine a rest talk set would be viable with defensive investment. Maybe:
Mega Sableye@Sableyte(?)
252HP/+252SpDef/4Def
-Rest
-Sleep Talk
-WoW/Power Up Punch
-Knock Off/Foul Play/Payback
Or:
252HP/+252Def/4SpDef
-Rest
-Sleep Talk
-Calm Mind
-Dark Pulse
Admittedly, 50 Base HP is rather unfortunate, and this is all purely speculation. Alternatively, you could forego rest talk altogether with recover, but this makes status absorption impossible unless you lead with it and mega evolve immediately. Anyway, it's not terribly concerned about coverage moves as Dark is a very nice offensive typing.