>>13403288All that matters is the offensive, not the defensive. No ones going to use a non effective move when they have access to the super effective STAB
Water offensively destroys fire, you will be using water moves on this fire type. Psychic offensively destroys fighting, you will be using a psychic move against a fighting type.
Grass offensively destroys water, you will be using grass moves against a water type.
Fighting offensively destroys Dark, you will be using a fighting move against a dark type.
Fire offensively destroys grass, you will be using a fire move against a grass type.
Dark destroys psychic, you will be using a dark move against a psychic type.
Who in their right mind uses a fighting move vs. a psychic type, a dark move vs. a fighting type, or a psychic move vs. a dark type.
So yes it is a reverse type triangle, an offensive one if you want to get technical.