I mean, it's not like sun is the best archetype in the game, and I personally think that we should have taken more time to decide the result of the Volc suspect, but thx anyways for the clarification
You're thinking about this backwards: Gouging Fire MAKES Sun the best archetype because its Sun + Proto (and potentially DD/CB) boosted nukes are unreasonable to respond to as an offensive option in the OU landscape. It's similar (if more extreme) in nature to Archaludon's absolutely perfect Rain synergy taking the archetype from the mid state it exists in to the most dominant style when it was OU.
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On the matter of Roaring Moon, my question is why it was the Ban elected to Suspect-down. Reactions to the current Meta sound mixed at least, not necessarily without room to improve at least, but I'm curious what Roaring Moon brings that led to it standing out as the option discussed by the council and getting enough traction to warrant disclosure to the Forum. OU still seems packed with very powerful and shaping threats, but none that we consider valid to act on (i.e. excluding things with multiple survived/repeat outcome suspects like Kyurem and Volcarona). I guess I'd rephrase to ask if Roaring Moon has a hypothesis to test, or is just the most immediate option we can justify acting on to take a shot in the dark.
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(For the record: if the verdict is non-negotiably going to remain Terapagos-Tera and Stellar cannot be handled or discussed separately, I still stand by the below rambling as a sort of Devil's Advocate/Talking point about tiering policy since I inevitably expect Gamefreak to continue creating weird mon cases like this going forward as they have since Gen 7)
Also, since there was no explicit shoot-down of the subject, I want to say that Terapagos-Terastal vs Stellar is a valid consideration for separate tiering. Virtually all of Smogon's tiering rules are gentlemen's agreements at the team building stage, and while it's fair to note that Rayquaza was a break in precedent by taking place in battle, it ultimately still does not require any modification of the game state to achieve. The idea itself is not hard for a layman to follow ("Terapagos-Ste is an Uber Pokemon"), in the same light as banning an individual Pokemon ("Annihilape is Uber") or item ("X Gem is Uber"), even if supposing we have to specify it as "Terapagos Stellar Clause" in the ruleset.
Distinguishing between the Mega vs the Mega Stone as the compared precedent feels missing the forest for the trees: if the concern about "Complex Bans" is for making it hard for players to comprehend or track, I covered that concern above with the result being identical ("The Mega is not allowed in a tier even if the base form is") and easily summarized; if the concern is slippery slope of trying to allow Pokemon into a tier with a handicap, Terapagos-Stellar clearly functions differently from other standard Pokemon under Terastalization (including having a distinct name, BST change, and a rigid interaction with the mechanic due to being Stellar locked), so the ban can not be equated or equivocated to "Terapagos-Tera with a move/stat handicap" the way that "Annihilape without Tera" or "Archaludon without Electro Beam" might be argued as removing a piece to preserve a Pokemon. It is very clearly not using the generic version of the Mechanic despite consuming the same "allotment" for itself. We do not count Roaring Moon as "Roaring Moon-Fairy" when it uses Fairy Tera because the underlying Pokemon is not altered, fixed, or unique to the same extent as Stellar Terapagos.
If anything, an OU Terapagos-Stellar is almost an identically functioning case to Ubers Mega Ray with even less opportunity cost: a form change that requires no significant investment to have as an option (Rayquaza is going to want Dragon Ascent regardless of the Mega option) from itself or any teammates, with a base form that is a perfectly reasonable presence overshadowed by specifically the "Super" form being unequivocally better than everything else such that nothing competing for the mechanic will see play while it is present. Aside from the absence of an item, how does Mega Rayquaza's ban differ from, say, OU's Mega Lucario ban IN SPIRIT? The resulting ban scenario remains "we want specifically the form given by this mechanic to not be accessible in the tier, without removing the base version," mainly distinguished by Rayquaza's abilty to hold items (which only affects its Power but changes nothing in the comparison since every Stone Mega is identical on the item slot, so it never defined a single set) and Ubers' higher tolerance for power and centralization (which speaks more to the intensity/threshold of a problem element than the methodology or principle behind a Ban compared to OU).
My point is that without doing something drastic like this then I dont see how a terapagos complex implimentation would even work. I feel the option that most people bring up, that being to just ban it from using it tera stellar form without any compensation. This is one of those ideas that sounds valid until you really think about it then you realise how flawed an idea it is. Cause like how would it even work? Would terapogos tera icon just be grayed out and usuable? Like even if tera wasn't used by you and terapagos is your last mon you still can't tera it? Like are are we really ok with having a mon in gen 9 that literally can't use the tera mechanic, ya know the mechanic that the gen was built around?
Not only would this feel weird and like a slap in the face to those using terapagos it also would lead to some weird balence fuckery. Like for example it would actually would be optimal that if you have to sack a mon you should sack your terapagos over other mons because your other mons can still use tera late game for a match up flip or extra damage at a crucial game winning moment, meanwhile terapagos can't engage with the tera mechanic at all in this hypothetical.
I really can't think of a third option way of implementing terapagos while banning its stellar form. So since these are the only two options and we aren't gonna impliment either, terapgos has to stay banned even if it would be a positive addition to OU.
Unironically, yes. All discussion in favor of a Terapagos drop/clause is on the premise that Terapagos without being able to Tera into its Stellar form or ANY form would be a beneficial presence in the OU tier, its problematic interaction coming from how overwhelming specifically the Stellar form was. The hypothetical game scenario of losing because you can't use Terapagos Stellar-Tera is irrelevant because by the same clause this hypothetical runs on, the player KNOWS Terapagos cannot use their Tera and would neither build their team nor conduct their in-battle actions around that being an option, any more than someone building a team centered around Mega Mawile in a tier where Mega Mawile/Mawilite is banned. If the player did not use Tera at an earlier point such that they have it while Terapagos is the only mon left, despite knowing when they fielded the team that Terapagos-Stellar is not a permitted option, they are playing poorly or handicapping themselves throughout the rest of the match with their other 5 Pokemon, given Terapagos does not come with any opportunity cost when played without Stellar (compare even the idea of multiple Megas or Z-Crystals penalizing the unused Holders).
I don't understand what is "weird balence fuckery" about a mon playing by pre-agreed rules; the equivalent of how this reads to me is finding it odd that a Soccer/Football player (who is not the goalie) cannot pick up the ball with their hands to prevent the opponents from scoring: they physically could, but the rules forbid it from fair play.
As I already stated, all of Smogon's bans are functionally agreement to a ruleset without any tech-based enforcement behind it on the official software (the cartridge accuracy is not just a point of pride, it's a "Rule 0" to tiering around a Pokemon Generation instead of making our own battle system variant as several OM Smogon hosts do). An additional agreement of "Terapagos cannot click Tera->Stellar" is no more outlandish than us barring players from being able to put Pheromosa or Genesect onto a team meant for an OU format battle, enforced by preventing the selection on the simulator for simplicity but fully replicable by choice in a SV battle. Similarly on the "mechanic that the gen was built around" point, I talked at length about how Terapagos-Stellar is functionally a Mega Evolution that takes the Tera Slot moreso than standard Terastalization.