>>29906671Gigalith looks like it would need an assault vest, but it also gets wide guard which is always nice to have. It could act as a semi-support/offensive mon with Bulldoze instead of EQ for that speed control. A-dugtrio will most likely be sashed since even with a steel typing it dies to a breeze, Stabs+rock slide looks like the best option. Salamence can't win the game on its own without a mega but it can switch safely on any of Gigalith's weaknesses, and intimidate is always nice. It could run specs for a special set or try some Z-move. Celesteela looks very interesting, I still don't know what to make of it considering it's a Skarmory that behaves like a grass-type. As for the tapus, I could run TApu koko to punish rain teams (but I don't think I will really need it considering Gigalith pretty much guarantees that Sand will overwrite everything else), or Scarf tapu lele which can be a monster (I loved Scarf Gardevoir to deal with terrakions and salamences in VGC15, and TApu Lele is exactly like Garde but better in every way) if I need to dispatch dragons or fighting-types quickly.
For the "obligatory bulky water slot" I could use Gastrodon or even go double Tapu with Fini. Toxapex could also work very well in order to stop Salazzle and Gengar from ripping through my team, but the idea of it being weak to EQ really bugs me. The sixth slot could be taken by something that prevents Trick Room (Incineroar could work pretty well, with both Fake out and eventually taunt) or some other slowmon that could abuse of the opponent's TR (a playstile that won Arash the VGC13 and that I always admired).
Chances are that all that I'm saying right now will result in gibberish once I actually start playing and I might end up playing something different though.