Board Thread:Questions and Answers/@comment-35146927-20180329234223/@comment-32271305-20180330012353

He's weak to the GT link, so to maximise damage output you'd need to keep at least two GT units always together (such as SSJ3 Goku GT or Omega Shenron next to the SSJ4 Goku friend).

Pro tip: the units you put in the first two slots always stay together, while the unit you put in the third slot comes back one turn later. Unfortunately Omega Shenron has the ability to freeze your characters, but if you use a Senzu bean or a Dende you'll be able to move them again freely.