This few tips will help you to understand taming ghost wolves.

How to Tame Ghost Wolf

You can get ghost wolves from the ludern mission to help the professor he gives you special manicles… They were not worth the effort…

So you will need a rope, or chains for people. Essentially you need to have someone tanking them with the beastie focused on them, and then have some one else behind them who can attempt to capture with the rope. they will have a special skill ‘popup’ which looks like a skull. I find having a bear better though.