Poltergeist is a good choice, but it isn’t 100% accurate. It also fails if the target doesn’t have an item.
Shadow sneak is another option because it gains priority, but it’s only 40 power.
Shadow claw has reliable damage and accuracy as well as a significantly increased critical hit rate.
Overall I would recommend shadow claw but it’s up to you. For the purposes of my answer I have assumed that this is for competitive use. Also I didn’t include any special attacks or status moves because I assumed you were looking for attacking moves, and ceruledge has a much higher physical attack.
Hope I was able to help!