Unfortunately, it is not possible to pass down a hidden ability Pokémon without breeding. In addition, while you can find Pokémon with their hidden abilities in Max Raid, this doesn't apply with the Scorbunny Line. Sorry about this.
If you were to breed, lets just say to get a nature or something in the like, if you have a female, you're in great luck. There is a up to an 80% percent chance of passing down a Pokémon's Hidden Ability if they are. To do this, the Scorbunny must be bred with a male in the same egg group. If not, then you have a small chance of getting the hidden ability if you're breeding with a Ditto.
I hope I helped!