Board Thread:General Discussion/@comment-38884348-20190321211411/@comment-39012089-20190513003558

I think that after Flowey absorbs the SOULS, teleporting somewhere since the room after he absorbs them is all black, which might be somewhere in the void, because he has almost ultimate power, so he could teleport to a whole new timeline. Or he could load the genocide SAVE file after everyone is dead and the world is erased, and then after he is defeated the timeline is back to normal and frisk is across the barrier.

or simpler Frisk is secretly a monster.