Pplherearemad said:
This is a very, very different case. Chara no longer existed and was brought back by the will and Determination of Frisk/the player entering the Underground. Asriel's essence was trapped in a soulless body.
No, the player gives Frisk to Chara on a silver platter throughout the entire genocide run. Again, if at literally ANY point before the Sans' fight Frisk spares an enemy or leaves some monsters in an area alive, Chara loses control completely and is unable to get it back as long as that timeline is in existence. They don't get control over Frisk nearly as easily as you seem to think.
Flowey doesn't overwrite your save. He flat out destroys it, in front of you. Which is also besides the point, because the point is, just as in the Asriel fight, your old save/the old timeline no longer existed, yet it was brought back. Also, you don't overwrite Flowey's save by entering the Underground. You take away his ability to save.
@Alice
1. That doesn't really matter, for this. People are treating it as though Flowey had no idea how powerful Chara could become, despite NEVER showing any surprise at the strength they gained. This isn't Flowey making a random guess about someone he's never met. It's him talking about his adopted sibling. In fact, he knew so much about them, he even knew they'd end up stabbing him in the back, but didn't really want to believe it until it was too late and he realized how screwed he was.
2. Pacifist Frisk is at the very least above Photoshop Flowey on a defensive level, obviously. Can't say the same for their power simply due to being completely unable to harm Asriel and also being a pacifist, but that's obvious. It should also be noted that Frisk doesn't do anything but stop Asriel from resetting while being alive and refusing to die. Their Determination was obviously less than his (because he was still the one in control and made it impossible for them to save or load), but it was immense enough to at least hinder that specific aspect of his power.
3. I'm pretty sure the universe having a seizure and going all 2001 counts as "glitching it out" or messing with it, in some way. Yes, Chara encounters you in the now blank FIGHT screen. Flowey doesn't. You simply load the game and there's nothing. Also, see the previous point about souls being able to bring the world back. This isn't really something that can be argued from what we've seen. Not to mention that all evidence points to the barrier existing after the universe is gone. Asriel destroys the barrier AFTER he's already destroyed the timeline, so it clearly still exists in the absence of everything else. Also, the barrier is magic. It was made by wizards using Soul Power. Nothing hints at it being a physical barrier, especially since literally anything can accidentally fall into it.