I hope you succeed because Moon is super boring. I remember that game and again it worked specifically because that's uncommon. Still is too, even Gambit is more likely to use Tera Blast Fairy and that's super uncommon. I'm gonna be real, tera ghost dd/sub/knock/bb is like niche of niche. Tusk completely walls you. Brick break for Gambit is rare but viable on the flying set because you still have acro and knock to hit everything else. With this you're stuck with knock, that's not really viable.
+1 252 Atk Protosynthesis Roaring Moon Brick Break vs. 0 HP / 4 Def Great Tusk: 132-156 (35.5 - 42%) -- guaranteed 3HKO
Mhh, no. You would realistically have one dd up since you have a sub up, so tusk does have to be careful about it's health. Drop to 60% or lower, and its dead.
Anyways, just got back home, so I'll post the sets I was talking about.
https://pokepast.es/45d6eddf541fdd11
I'll explain each in detail.
Bulky lefties set
This set abuses the fact that moon has pretty good defenses, and with just a + speed nature, can naturally outspeed tusk. The combo of dark+fighting+ground is only resisted by enam. It can even take two tusk ice spinners. While it doesn't do much damage to start, it can get boosted super easily. I chose tera fairy because that is a good defensive type.
Grassy Seed set
The only set I have actually used, so I can say this is pretty good. It abuses the defense boost from grassy seed to get dd boosts, while recovering hp. Roost allows it to continuoly do this.
Assault vest set
This is a set that abuses the bulk of moon. The speed evs are to outspeed kyurem, while the hp and special defense evs means it can take a +2 volcarona tera blast dragon (though I think it might have been for something else). Rest is dumped into attack. Tera water is a good defensive typing and means it can wall lots of things (It can easily take a specs kyurem ice beam and +2 darkrai ice beam).
Sub lefties set
This set is a that can sub up and start boosting. The evs are to live as many physical hits as possible, while with tera bug you can be pretty good against fighting type moves.
Sub ghost set
Abuses the fact that fighting type moves are usually used against moon. The combo of dark+fighting is pretty good, though e-quake is something that could be put in. Destroys the metal birds and can play around gambit.
Snowball set
A gimmicky set, but it plays off the fact that weavile ice shard is used to revenge kill it. By using tera water, you resist the hit and get an attack boost, meaning acrobatics is superpowered.
Tera blast grass set
Destroys both dozo and tusk, who can't take its attacks. This means that lots of mons that may have been good against it are now prey for it.
Trapping set
This is a gimmick, straight up. Uses fire spin to trap opponents. Tera fire allows it to have a nice defensive typing. 104+ allows it to outspeed volc, most are dumped into bulk and some into attack to finish the opponent off.
HDB set
This is basically the booster energy set, but instead it utilises the multiple opportunities it gets to come in and threaten a sweep. I went with tera ground to make e-quake a lot better. Destroys teams that think they can scout which of e-quake or taunt it has and then wall it.
Breaking swipe set
Basically Gouging 2.0. Outspeeds Dragapult at +1, while also being able to take a +2 tera water ivy cudgel. Is better in some regards because it can outspeed more things, but worse in some since it doesn't have as much power.
Roseli Berry set
A bit of a gimmick, but this set can use fairy types as setup. Can take a valiant moonblast from full. Then it can start sweeping. Tera steel means it can switch into fairy types even if the roseli berry is knocked off.
Zen headbutt Choice band set
Uses zen headbutt to deal with tusk, which is 2hit ko'd. Tera bug u-turn is also really powerful.