Bruno is the 2nd challenge at the Elite Four and a decent one at that.
He’s a fighting type master and thus all of his pokemon are that type. Though some of them are curveballs such as his hybrid ground/fighting and water/fighting types.
Which makes it a bit difficult to remember which pokemon to use against him. But his team isn’t that difficult to overcome. Though you may have to use a good deal of healing items after it’s over.
Only two more of the Elite Four to go!