LogFAQs > #912958858

Here's some more fun facts:

If you keep 'visiting' Flowey by fighting Asgore, and assuming you didn't kill Flowey at the end of your first run, he'll starts talking to you. As said in the topic, he mentions that's he's not going to fight you again because it'll just go the same way as it did before, but he says some other fun stuff too. Most notable thing is that Sans has killed him in a lot of other timelines (presumably when Flowey started to cause trouble).
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Black Turtle did a pretty good job.