I was waiting for this post. What is Dugtrio's problem? The pokemon individually is not a big problem, however, when you find a duo good enough for dugtrio to break almost an entire meta then that's when Dugtrio becomes a big problem, the current problem is Dugtrio + PZ OR Yanmega, even if they ban PZ, Yanmega + Dugtrio would still be a problem.
When PorygonZ went down, the players who now ask for the ban of PorygonZ or Dugtrio did not have problems because of PorygonZ, why? because the meta was able to adapt, and as a consequence we saw the rise of Gigalith to UU, everything seemed to be going well, yes, Dugtrio was in the level, but he did not have 100 base atk, but the great council of the level decided to return the 20 points of atk base on Dugtrio, as a consequence of that buff there was enough damage for PorygonZ to sweep against teams that had Gigalith-Empoleon as their main brake, now to win tournaments you just need to use PorygonZ-Dugtrio and boom, you won a tournament, OMG what good player.
Even if Dugtrio's buff is removed, he will continue to break the meta along with PorygonZ, because people already realized that this duo can kill almost everything, it will not be the solution, simply banning him from UU is the only thing that can be done , but why not ban it from OU? Because it doesn't have a duo with which to destroy the meta or be a great threat, Dugtrio + Togekiss? There's too much rotom for Togekiss to be a huge threat, even if it's not rotom, Weavile destroys both pokemon, and so there are even more brakes that can't be solved with Dugtrio, Dugtrio just won't be a real threat until he meets a duo/strategy strong enough to be a cancer in OU.
Yes, Arena Trap's ability is a cancer in all meta and tiers of all pokemon, but in PokeMMO OU for now it doesn't seem to deserve a ban, it used to be a cancer when used to destroy Chansey/Blissey with Screech and Wobbuffett for the Rain to destroy everything, but currently thanks to Teleport this strategy can no longer be carried out.