Thundurus-I @ Life Orb
Ability: Prankster
EVs: 68 Atk /188 SpA/ 252 Spe
Naive Nature
-Thunderbolt
-Hidden Power Ice/Grass Knot
-Knock Off
-Thunder Wave
Basically the mixed Thundurus set except with Prankster and T-Wave.
Thundy and Mega-Hera are best buds. Between Thundurus, Scarf Tran, and two Intimidate users Hera doesn't have to worry about birds at all. Thundurus lures Lati@s with Knock Off alleviating one of Hera's (and really the team's) biggest checks. It also zaps bulky water types which this team struggles against. Hera, Tran, and HP Fire Latias can beat Ferrothorn so you can spam Thunderbolt unimpeded. Priority T-Wave gives the team a panic button against opposing set-up mons, and can slow down offensive teams to allow Hera to plow through. With para-hax and sub, Gyara might also be able to snag a game winning extra DD. The choice between HP Ice or Grass Knot goes down to what you think is more useful in the current metagame. GK can surprise KO Quagsire on stall and smack Hippowdon for big damage. HP Ice is get past Garchomp, Gliscor, and opposing Landorus.