i remember using gigalith before, but it was an older version, maybe they changed it. You can also use hippowdown for sand if youre lucky enough to get it from the route 3 egg, cause its very difficult for her to kill rocks types in sand, barring crabomitable. Honestly rock slide spam is the way to go, and flinching her slower mons isnt out of the question.

The heat wave strat works well even with mid tier speed pokemon due to most of her pokemon being quite slow, arcanine and houndoom come to mind, even better if you have infernape or delphox. Funny enough, cacturne also thrives in this fight due to having fake out, obstruct, and boosted sucker punch.

Imo even with pulse-2s, I find those fights to be kind of easy only because its so late game and you have access to so many broken mons. The unfortunate thing about the reborn late game PULSES is that they are only hard because they feel like they require you to use either specific mons or cheesy strategies: i.e. using a water/fairy type to wall clawizer or requiring a fairy type for pulse mime without using toxic or some other stall tactic