Seriously, this guy can be used to a huge advantage in battle.
Role/What it is going to be used for: Special Sweeper.
EVS: 252 Sp Attack/252 Speed/4 Sp Def
IVS: I Would recommend to get at least over 20 for Sp Attack and Speed.
Quiver Dance: Raises SP Attack, SP Defense and speed by 1 stage (very op)
Flamethrower/Fiery dance: Flamethrower for STAB, chance to burn target. Fiery dance for Raising SP Attack (50% chance)
Hidden Power (Water or Grass)/Giga Drain: It sucks it couldn't learn Giga Drain in S&M, So Hidden Power is for S&M
Bug Buzz: Main Stab, Good for Killing Psychic Types :)
Disadvantages: Dragon, Rock (if it would resist grass & water), Flying Types. Also Physical Sweepers/Attackers.
Overall, This Pokemon would be Very good in Double Battles, With a Pokemon that has the Ability Dancer, Can also set-up. I used this Pokemon for the Battle Royal :DDDDD Worked out Great