Special Grimmsnarl set
Grimmsnarl has a 95 SpAtk stat, which is not bad. Of course physical Grimmsnarl is better but I got a modest one so I made this set.
Grimmsnarl @ Life Orb/ Leftovers
EVs: 252 HP, 252 SpA, 4 Def
-Dazzling Gleam/Draining Kiss
Nasty Plot to boost SpAtk. You can almost always get a Nasty Plot off because of Prankster. For STAB I picked dazzling gleam for damage or draining kiss for hp recovery. For coverage focus blast is a good option to counter steel types. And lastly Dark Pulse for STAB.