There is one way
Because Metronome has normal priority, it can allow negative priority moves such as Roar to have normal priority.
That is the only way though, and it doesn't make for a strategy, and so it hasn't been addressed by GF. There was another way last gen, which was by using Copycat and Prankster to get +1 Roar, but it was fixed in X and Y so that people can't spam priority Roar with hazards up.