Board Thread:General Discussion/@comment-27317758-20160626184257/@comment-27701762-20160626193542

A True Reset completely wipes everything, returning the world to a state as though the game has never been played before. Which is exactly what Flowey explains at the end of the True Pacifist route. Flowey returns to being Flowey once the human souls are gone, and once a True Reset occurs Flowey does not remember anything that happened.