Alpha Flowey is from the Underfell AU. He has the 6 Human Souls in him, and wants to help Monsterkind, which is no longer as hostile, go free.
“Howdy… I’m Flowey…” Alpha Flowey said with a warm, loving smile. “…I still need more power to shatter the barrier since we managed to spare all the hostile Monsters. Their hearts aren’t as heavy now.” He said. “You managed to convince them all that Mercy isn’t a weakness.” He said in relief.