Cheryl. Yes, it is viable.
Its only counter is Arceus-Ground. +2 Stone Edge is dangerously potent and, in tandem with Earthquake, hits everything in the metagame. Filler candidates range from Gravity, which allows one to increase Stone Edge's accuracy whilst simultaneously allowing Bronzong and Skarmory to be hit with Earthquake, to Psych Up, which abuses the fact that Dragon Dance-boosts increase Attack and Speed of Mega Salamence and Rayquaza, something Calm Mind variants are unable to take advantage of (it survives +1 Earthquake at full health, proceeding to revenge-kill with said boosts retained). These qualities, which its unique Rock-typing grant, are what distinguish it as a Swords Dance Arceus form.
That said, Stone Edge's unreliable accuracy, in addition to the forfeiture of Arceus-Rock's traditional utility in role-compression as a check to S-rank threats Mega Salamence and Ho-Oh (Intimidate and burns are to blame for this), severely undermine its viability from that of a versatile support glue to gimmicky sweeper.
Nonetheless, at least compared to Generation 5, Arceus-Rock's Swords Dance set is fairly viable and packs potential given appropriate team support, but purely in terms of viability within the metagame, one may, more often than not, find that its flaws outweigh its aforementioned offensively-oriented assets.