My Rowlet is level 31. I don't hate Decidueye but I like Rowlet a lot. I'm running Eviolite on him.
I'm still doing the story, this guy isn't meant to be competitive obviously.

Is evolving him worth it? I mean obviously the stats are, but as far as moves go. Does it automatically gain Spirit Shackle, Shadow Sneak and Phantom Force upon evolving, or just Spirit Shackle?
How do I teach it those other two moves?
Doss it have to be a Decidueye or can Rowlet learn them?