>>43950848Gallade isn't exactely the best choice possible for OU, given its below average speed tier and low physical bulk.
You could, however, try out a Choice Scarf set (3 attacks + Trick / DBond / Memento), whom outspeeds Zeraora by 3 points, hits decently hard and can either cripple something with Trick, or provide momentum when the time has come via Memento.