I've been using Iron Moth lately and I'll admit, it can still be pretty OP, but it gets trashed by G-Fire all the same. GFire is just WAY too bulky and doesn't take enough damage from Sludge Wave. You need to properly align your pieces so that Iron Moth fishes for a Fiery dance boost on something else before GFire is coming in order to beat it.Just gonna say this but if you are fearing that sun is taking over as the new oppressive archtype.... there is a forgotten threat that used to be in OU you know. Iron Moth!
Just destroyed an entire sun team with this mon on this ladder including Gouging Fire. In fact if any sun teams are in any disadvantagous position it is easy for Moth to just sweep them entirely. Sun also has some very easy to exploit mons like Torkoal or Walking Wake that just dropped a Draco so it is easy for Moth to just end behind a sub too. The only hope they have is roaring moon but only if Moth is not behind a sub and encore H-Lily which they have to position really well and chances are Moth already claimed a bunch of kills. I would love to post replays but at this point I have probably posted so much of them, it might seem like spamming
That said I understand that Gouging Fire can look completely overwhelming sometimes. The set-up variants can find a lot of opportunities to setup thanks to it its bulk and good typing. Despite it's variety, you can guess which set it is based on which Protoboost it has(although stuff like offensive Morning sun is not that rare as well). I usually play really aggressively against those variants as not to give them too many boost and they are not that threatning offensivley at +1.
CB variants in the sun: I feel guilty for using him and but I have so much fun with this mon (both attack and speed variants). Just turn your brain off, and click the button. Even Dragonite with Multiscale takes around half and he doesn't even KO you back with earthquake . Even if he doesn't outright sweep teams, the opponent will be forced to Tera their bulkiest mon which opens up other breakers and sweepers. Wanna save up that Tera for Gambit? Too bad, you gonna have to Tera your Lando JUST to get any type of chip against this mon and not let it devour your whole team. Which makes fighting Gambit a lot less frustrating, ironically. Best counters are bulky flash fire mons , other weather and a very bulky variant of Gouging Fire himself. Walking Wake can only come in once.
Not gonna say whetever he is broken or not though. I am having a lot of fun with this mon and I will be sad if he will be gone. There IS counterplay but I am not gonna judge if it is gonna be sufficient.
132 SpA Iron Moth Sludge Wave vs. 0 HP / 0 SpD Gouging Fire: 160-190 (45.5 - 54.1%) -- 49.2% chance to 2HKO
+1 132 SpA Iron Moth Sludge Wave vs. 0 HP / 0 SpD Gouging Fire: 240-283 (68.3 - 80.6%) -- 43.8% chance to OHKO after Stealth Rock
Sub probably is the play in the current metagame though. I've been using 4 Attacks, which may be why I've been struggling. Will give it a try and see how it goes.