A brave nature would be great for this set as it would add to attack and take from speed, considering this has payback. Another thing is that an Assault vest would be great, as it boosts special defense by 50%. I use this moveset with brave nature, assault vest, earthquake, and an ev spread of 40 HP / 252 Atk / 28 Def / 188 Sp. Def. Thumbs up from me!