I got to say this but- Is summoning Alcor is a bad idea?
But for real. It doesn’t come out as much in fics, because most everybody loves Dipper/Alcor and wants to see him happy with other people, but Alcor is a demon. A demon with some human instincts, sure, but a demon nonetheless. He wants to be on top. He wants to rob you blind. He really really really wants to see if he can finagle your soul into the bargain, because wow those are delicious. Sometimes his pesky human brain butts in and messes things up (what we would think of as doing the right thing), but nobody should rely on that. Summoning Alcor is a bad idea. A really, really bad idea.