I’ve just completed the requirements for the suspect test. While more experienced players have already shared their perspectives, and I’m not the most consistent myself, I’d still like to express my thoughts on this mon. I’ll do my best to make my argument clear and coherent.
The DD Tera Flying Acrobatics sets, as well as the Choice sets, have been used throughout the generation without much controversy. I don’t think anyone has had a major issue with them. For the DD sets, yes, it required taking significant damage (e.g. Lando, Corv), sacking something, or burning your Tera, but dealing with it was never out of reach, especially with Rocky Helmet chip damage and its relatively poor physical bulk, which made it easy to revenge kill.
However, the rise of the bulkier variants has made this mon a topic of debate, and I believe Tera is the main reason for that. The uncertainty of what type it will become, and if it’s running Eq or not, is, in my opinion, the single most significant factor that makes it unbalanced.
While grinding for the reqs, I didn’t save the replays, but there was one moment in my last game where my opponent sent out Roaring Moon against my Samurott (which had Sacred Sword), and it Terastallized into Fairy type, then used DD. I assumed it was running DD Knock, Tera Blast, and Roost, as it also had Leftovers. I switched in Kingambit, thinking I could survive a +2 Tera Blast and KO with Iron Head, but then it revealed Earthquake. Another instance involved me using a Tera Ground Roost set against a balance team featuring






.
They brought out Zapdos, and they clicked Thunder Wave, so I Terastallized to Ground type. This turned their Zapdos into setup fodder, and I won immediately because their ran offensive Zamazenta.
The fact that this mon can win instantly just because you made the wrong assumption about its set feels unhealthy for the tier. Moreover, its natural bulk (HP and SpDef), combined with its raw power and speed, allows it to invest in Def. Even after this, the fact that it outspeeds the fastest scarfers at +2 is nuts. Roost and Tera Blast (which doesn’t make contact) make it incredibly hard to land significant chip damage on it. Essentially, you need to knock it out in one hit. If it restricts offense into running Scizor just to deal with Tera Fairy sets, what happens when it’s Tera Ground or Flying ?
One argument from those who favor the DNB stance is that you need to pressure it enough to prevent free setup. However, depending on its set, this mon can turn almost anything into setup fodder, as I’ve demonstrated with Zapdos. Luring in mons like Glowking or Ghold isn’t too hard. The mon can also hit, it isn’t programmed to automatically click DD. This forces players to make unreasonable plays, like staying in with Glowking to try to status it, knowing you still need that mon to deal with their Enamorus/Iron Moth/Iron Valiant.
Personally, I will be voting
BAN, as you may have already guessed. I believe it is fair to say that Roaring Moon is an unhealthy presence in the tier. I don’t see how banning it would enable other mons, it’s just there and puts unnecessary pressure on the builder.