https://pokepast.es/a32dd056f5eadc4f
Sorry I didn't know what your evs and natures were, but it should work. Zeraora should sweep a lot, and in some cases you won't need to bring out anything else.
Gastrodon can deal a bit of damage, but toxic and recover can toxic stall. Switch out when running into a grass type tho. Finally, gardevoir is equipped with will o wisp to allow it to take physical hits, and calm mind lets it setup, and moonblast and psyshock are strong STAB. Psyshock to you aren't walled by special tanks. Sorry if this is horrible, I have not much of an idea of swsh battle tower, idont even play it lol, but it shuld be good.
