Either S-Class or Blast’s group. The final page pretty much confirms there will be some other shit going on soon where i expect Garou to evolve one more time into a leaner final form (similar to Frieza) and fight Saitama seriously.
This fight has just been a little joke, Saitama never went serious either.
Plus im not here for the Cosmic appearence of his new form. Id prefer a more monsterous appearnce. Not as ugly and boring as before, but something idk…cooler but not mecha looking. Since his half Monster form….Garou hasnt been looking good.