Musharna could possibly even use Colbur Berry effectively.Calm mind or even curse musharna is a great baton passer. I haven't personally used it except I have spectated some battles from other people in the NU room and it's incredibly bulky, and is a good baton passer overall. It isn't great if u want something to get up a quick boost though, it's better to stay in and keep setting up because of its bulk. I would make sure there aren't any powerful knock off users or other strong dark type before setting up.
252 Atk Life Orb Liepard Knock Off (97.5 BP) vs. 252 HP / 252+ Def Colbur Berry Musharna: 126-149 (28.8 - 34.1%) -- 3% chance to 3HKO
0 SpA Musharna Dazzling Gleam vs. 0 HP / 0 SpD Liepard: 212-250 (78.8 - 92.9%) -- guaranteed 2HKO (dead after LO + SR)
And then you have no item so Knock Off isn't even a problem anymore due to Musharna's raw bulk. It does seem like Colbur + Dazzling Gleam allows Musharna to get past its best counters like Spiritomb, Liepard and... yeah that's it for counters. Sneasel and Pawniard are not even switchins. I'm starting to think that more people should start using Mushy again. You don't even need to Baton Pass, Mushy can sweep on its own with Moonlight and CM because it's so bulky and powerful with just one or two boosts. Mushy's only real issue is 4MSS because it would like to run Heal Bell/Dazzling Gleam/Psyshock/Moonlight/Barrier/Baton Pass but it can't.