I'd change Roar of Time into a 120 Base with no drawbacks, to make it useful. ( 8PP and imperfect accuracy should keep it from being broken.)
What makes it useless? Aside from being restricted to a legendary.
Moves with a recharge turn are generally statistically worse than using two of the same, weaker, non-recharge turn move. In this case, the weaker move is Draco Meteor and/or Dragon Pulse. --- For those of you starting topics about the PS4, there's a PS4 board: http://www.gamefaqs.com/boards/691087-playstation-4