Board Thread:General Discussion/@comment-28303987-20160409204142/@comment-26887879-20160424103043

Well, it is implied that Flowey was created AFTER the six humans died. I guess he found out about six souls being in the castle later on, and didn't even had much time because Frisk fell soon after... And, there is a possibility that he was created not long before Frisk fell, but it feels for him like he lived long because of timeline manipulation...