A few set I'm having success with on my current HO build:
Lunala @ Lunalium Z
Ability: Shadow Shield
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Moongeist Beam
- Calm Mind
- Ice Beam
- Focus Blast
I was originally trying Dawn Wings Necrozma w/ the same item as I love the feeling of pain, so after realizing how bad that set is compared to Lunala, I switched and never looked back. This thing is amazing. Rolling with a timid nature to outpace most slower support Arceus formes as well as Jolly Rayquaza. Instead of running a Psychic move, I opted for Focus Blast to hit Normal and Dark types with a relatively strong attack, and Ice Beam is to hit Zygarde, Salamence, and Rayquaza without needing to boost or waste the Z move. You perhaps could run a Psychic move if you're nervous about Toxapex, but I feel these two coverage moves make Lunala's job as a breaker a lot easier, and my other set up sweepers appreciate its work.
Deoxys-Speed @ Rocky Helmet
Ability: Pressure
EVs: 248 HP /
68 Def / 192 Spe
Jolly Nature
- Stealth Rock
- Taunt
- Superpower
- Magic Coat / Spikes
This set's a bit experimental and idk if I'm gonna stick with this spread for much longer, but I've been loving it so far. Superpower and the 68 Defense EVs are the crux of this set as it allows me to handle Excadrill leads a lot easier. The defense EVs enable me to never die to an Excadrill's Earthquake at -1 as they'll always click that expecting the Taunt. Admittedly, it's a bit of a guessing game with this set, but in all honesty it's always been that way with Deo-S. For the last slot, I'm switching back and forth between Magic Coat and Spikes as MC helps my matchup against opposing Deo-S while Spikes helps the team sweep easier.