Correction : It increases spd by 10.
My Concern:
Mamoswine : Earthquake, Blizzard, Ice Fang, Ancient Power
Dragonite : Aqua Tail, Outrage, Hurricane, Fire Punch.
as outrage or hurricane would do more damage to Fera, water types, except Gyra(as electric is 4x) moves than Thunder Punch so no use...