>>44176549>No battle goes on forever.Well, technically...
https://replay.pokemonshowdown.com/gen8ou-1032701336But really, most stallfags win through their opponent forfeiting out of frustration, or by inflicting the opponent with status and simply surviving until the opponent dies.
Pebbles hinder their ability to survive because they deal chip damage when they switch (the most common way to survive in stall).
There are stallmons that negate the pebble damage, like ones with regenerator and magic guard, but those are the minority and if anything prove how much pebbles hurt because those abilities are so valuable on stallmons.