I like the idea, the problem is I think this set tries to accomplish three things at once. It tries to be a setup sweeper, a mon with priority, and a mon with strong coverage. If you want a good physical Mega Ray setup set, there's DazzleSmash. Dazzling goes well with Shell Smash. Otherwise, the best setup Mega Ray sets are Special, more specifically Triage with Tail Glow. As for priority, you should either run Extreme Speed alone over Head Charge, or you should run FakeSpeed which is the standard set. As for Head Charge, I like the idea, but it's more normally seen on Kyurem-Black.
Kyurem-Black @ Icicle Plate
Ability: Refrigerate
Shiny: Yes
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Adamant Nature
- Fake Out
- Extreme Speed
- Head Charge
- Sunsteel Strike
This is what I've tried, although the problem is that you're running three Ice moves. You can get rid of Fake Out for more coverage like Precipice Blades. This set is more specialized to my team which is why it does not have Ground-type coverage.
I really don't know how to say this without sounding somewhat rude, but Zweilous has absolutely no place in Balanced Hackmons and you just can't get any use out of it. The Pokemon itself is horrible. It's an NFE without much actual use. Gyarados and Yveltal can have similar bulk even with Eviolite factored in so they have a free item slot. They hit harder right off the bat. Most importantly, they can actually serve a niche for the team.
I really must put emphasis on this:
Setup sweepers are more effective if they can be equally dangerous in less turns.
If you have to take a few turns to use Iron Defense, a few turns to use Amnesia, a turn to use Imprison, then you have a good base power of Power Trip, you're forgetting exactly why Power Trip is so threatening, or why setup sweepers in general are threatening. With Shell Smash, right off the bat you are instantly more threatening to teams. It takes 1 turn to be a threat with Shell Smash compared to the half a dozen or so turns that Iron Defense and Amnesia take. You might ask why this matters, and the reason is that Amnesia and Iron Defense users are more susceptible to Spectral Thief. Zweilous is also 4x weak to Fairy and is massively threatened by anything carrying Fairy-type coverage.
252 SpA Choice Specs Mewtwo-Mega-Y Fleur Cannon vs. +6 252 HP / 252+ SpD Eviolite Zweilous: 176-208 (50.5 - 59.7%) -- guaranteed 2HKO
That's not impressive. At all. Considering your Zweilous set also doesn't have recovery moves, it just dies considering that it's more than likely heavily damaged should it get to +6 in a certain stat. U-turn actually has a good chance of putting Zweilous into knockout range for plenty of mons.
Simply put,
please stop using Iron Defense and Amnesia. Seriously. They aren't useful, viable, or worthwhile in any sort of way whatsoever and no set you theorymon will make them work on any set. Spectral Thief is just so common that it's not worthwhile. Before you mention it, no, Normal-types aren't viable with them either despite their immunity to Spectral Thief. A lot of stuff carries Haze too. The reason Shell Smash and Tail Glow are good is because of the fact that they only take one turn and are far less susceptible to Spectral Thief and Haze.
I hope I didn't upset you at all, I'm just trying to help you improve as I genuinely feel like that these sets are very misguided.
Completely outclassed by BellyBurden Dusk Mane. Here, check out this set:
Necrozma-Dusk-Mane @ Sitrus Berry
Ability: Unburden
EVs: 252 HP / 252 Atk / 20 Def / 252 SpA / 252 SpD / 252 Spe
Adamant Nature
- Belly Drum
- Sunsteel Strike
- Photon Geyser
- Precipice Blades / Power Trip
ElMustacho helped me make a different set some time ago that may be of interest to you.
Necrozma-Dusk-Mane @ Sitrus Berry
Ability: Unburden
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe
Adamant Nature
- Belly Drum
- Sunsteel Strike
- Icicle Crash
- Earthquake
This set is a bit more reliable, but the first set is much better against Imposter. If you can get consistent chip on Imposter Chansey via hazards and the like, this second set may be better for you.
Check out this link for viable sets.
https://docs.google.com/document/d/...Uht9rKOOMDbGvDvu8g5vHcA5W7gXlgMaNftz6xuCl/pub
This is an official link from the Central Resources page made and maintained by E4 Flint and the BHC. Me and quite a few others are actively aiming to contribute to the Smogon Dex. I just made a Dialga analysis that you can view on the Smogon Dex and I'll be doing Dusk Mane soon, I figured you'd be interested considering that you had just made a Dusk Mane set.
Anyways, if you have any questions, by all means please do ask them. Don't be afraid to share your sets, either. All I aim to do is help the community, particularly newer players, get into Balanced Hackmons.