Alkaiser, powered by the soul of a Phoenix, complete with the rebirth of Red's powers midfight.
How do you put out the burning power of a Phoenix? Damage? Rage? No. You dump water on it and put it out, rather than letting it go down in a blaze of glory, only to rise again shortly. While Sailor Persesphone normally specializes in fire damage, her teammate does not.
By the time Sailor Kyogre finished off Alkaiser, there wasn't much left of the once proud Red, proving that having teammates that can actually fight when you tap into your superhuman powers are -invaluable-.