I feel like something worth pointing out in AAA is that, for offense, there are a lot of extremely strong attackers that are lacking in OU (like Noivern, Hoopa-U, MegaZam, Latios, Victini, etc., etc.) that can only be checked by either extremely tanky, passive pokemon like Chansey, or steel types like Magearna. If offensive brings dugtrio + one of these breakers, it suddenly has an almost unloseable matchup against stall teams without Dugtrio (or Weavile). Also, because stall is much more bulky in AAA, it takes much stronger pokemon to break it, and the majority of these pokemon (like Terrakion, Victini, Latios, Hoopa-U, and even to an extent Weavile and Keldeo), can get trapped and KO'd by dugtrio, effectively making the rest of the team much easier to deal with. Also, with many more solid magic bouncers and walls, sending in dugtrio to kill things doesn't sacrifice as much pressure as it usually does. http://replay.pokemonshowdown.com/gen7almostanyabilitysuspecttest-524015654 - Here, my only way of breaking walls is really tinted lens Keldeo in rain. Dugtrio traps and kills Keldeo, making the game much much more in his favor. In order to win, I had to win a bunch of 50/50s while also abusing illusion. http://replay.pokemonshowdown.com/gen7almostanyabilitysuspecttest-529065941 - I know I'm demonstrating this with a jynx, but it applies to really any strong special attacker; this replay shows how I was able to find the right opportunity to get Dugtrio in to trap Magearna and easily win with a psychic terrain pokemon once the special wall was gone.