With the thread getting back on track, why not talk about our good friend Prehistoric Entei

With the suspect test in full swing, have people developed new techs/ rediscovered old ones to keep Gouge in line, or has this just solidified the notion of it being a phat bastard that's too hard to kill, hits way harder than it should and thus should be shown out of OU?
Well I want it gone. And it seems to be the sentiment around a lot of prominent players. But to try to answer your question on counterplay, which I feel is still insufficient, the best thing I found for it is phasing because it is the DD sets that are the
most problematic. Unaware walls would also work if Gouging wasn't a threat to 2HKO mons like Dozo. Generally, a team needs to pressure the opposing team so that GF can't get a free turn. This is easier said than done, though, so the ability to phase it can greatly help with this.
Tera Dragon can be somewhat mitigated, however, by having a Fairy type on the team and a Tera Fairy mon in the back pocket. If you have something that can resist Fire and also live one Tera Dragon Outrage, you can then take advantage of how Outrage locks Gouging in to switch and/or Tera into a Fairy. In this way, both Dozo and
possibly even Dirge are potential checks for the wallbreaking. Heatran maybe could do something similar if you can play around EQ. Of course, Dirge and Heatran are both niche in this metagame and passive Dozo doesn't fit on every team.
That said, there are too many sets and there's too much threat of raw power to have easy answers for everything. As long as Tera Blast exists, there will always be the ability for GF to counter whatever checks become more common. But even without it, the sheer wall breaking potential of it's Fire and Dragon STAB on Sun Band or Tera Dragon outrage makes even things that would otherwise check it able to die in one or two hits. Tera Ground is also a general menace that won't go anywhere.
One thing I have not seen much, but could potentially become problematic, is Burning Bulwark on DD sets to further discourage revenge killing. As it is, I find a lot of priority against Gouging to be unreliable due to its typing, bulk, and Tera. The one I have heard about is Dragon Tail (and maybe Roar), which also requires an entirely different approach when facing it.