Not enough to KO it, but more than enough to set up or KO you straight up. To be very, very honest, I would not be surprised if Rocky Helmet counterplay was done in order to counter this, along with proper resists or Ghost-immunities. This is a very dangerous 'mon that will absolutely need to be factored in every team, lest they are destroyed on the spot.
You're greatly overestimating Maushold honestly.
74/70/75 is mediocre at best bulk on a monoNormal, and note that this thing has 111 speed and a meager 75 attack.
111 speed in a format where most mons will be faster, stronger, and 1hkoing it before it can do anything.
It's also extremely monodirectional, it does one thing and one only, other than maybe click Encore on someone that tries to setup on it like a dragon type.
And as you guessed, istantly dies the moment Garchomp or a Rocky Helmet user shows up, on top of being vulnerable to Intimidate, entry hazards, burn and all the stuff phisical attackers are vulnerable to.
You're also not setupping anything btw, the thing doesn't get any setup move (intentionally, most likely) other than Substitute and Agility.
It's the kind of pokemon that'll get King's Rock banned and then drop to the depth of a random lower tier without viable ghost/rock/steel types, and get banned from that one.
Which definitely won't be OU with Dragapult everywhere for one.
Basically Cincinno but slightly less bad. UUBL if lucky, PUBL if not.
If you want to cheese things, Palafin is looking much better since it actually can take a hit or two.
edit: do note that however in VGC the thing may actually see usage, as it has the formerly clefable-line exclusive combo of Follow Me + Friend Guard, and a pretty decent supportive movepool to go with it.
