Added Thunder Wave next to Psychic, although I do feel that it is overall an inferior option, I will test it out. Odd as it might seem, it might also be worth slashing next to Slack Off as well.
I am going to try to put this in the nicest way I can: I think the specs set is an incredibly poor set for Slowbro that is just outclassed. The specs set is also directly opposed to the way I play, so I can't really test it out. If QC deems it to a worth while set, I am going to have to give up on this analysis, I don't have the experience or the belief in its usefulness to write about it.
VM me for a RMT rate if your team is defensive. I am not Scarf Wynaut on Pokemon Showdown.