Juubi Madara? Thats too much.
EMS Madara solos HxH easily.
..........I don't know who told you that but. Wow, Meruem would literally need to be trillions of times more powerful than he is to do something like that, and that's not an exaggeration. The HXH verse is capped off at town level for now, probably always will be honestly, that is without Alluka's reality warping of course