Volcarona

Volcarona is a unique attacker because it is the only viable Quiver Dance user in the tier, which in combination with great STAB moves in Fire Blast and Heat Wave, decent coverage against Water- and Rock-types in Giga Drain, and high Special Attack and Speed enables it to be a powerful special attacker. Its Speed allows it to Speed tie with Mega Kangaskhan and Mega Gardevoir and more importantly lets it outspeed many threats, such as Choice Scarf Landorus-T, once it has one Quiver Dance boost. Despite its okay HP and Special Defense, Volcarona is physically frail, so it struggles against powerful physical attackers such as Mega Kangaskhan and Talonflame, even though the former can be burned by Flame Body. Also, it has a tough time hitting Fire-types such as Mega Charizard Y and Heatran. Even though it has access to Giga Drain for Water- and Rock-types such as Keldeo, Mega Diancie, Terrakion, and Rhyperior, Volcarona still struggles against these Pokemon unless boosted by Quiver Dance.