Yeah, with Zone support, Grassium melts through Zapdos at +2, even if you don't have grassy terrain up. I've seen Grassium Z sets with Knock Off and Sacread Sword. But without Zone support, you could want Fightinium Z
I guess I’m asking if Zone support is even necessary because of how little Celesteela there is but how much Lando and Pex there is. So many BO teams nowadays have a Pex or Tang/Bulu or Heatran to switch between against Celesteela, but Grassium seems to be more consistent at killing something than Fight imo.