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Complete revision of the type chart.
Break everything into classes of three.
Elemental: Fire > Grass > Water
Mineral: Ice > Steel > Rock
Nature: Ground > Flying > Electric
Body: Psychic > Fighting > Poison
Spirit: Ghost > Bug > Dragon
Dark & Fairy are super effective to one another and Normal is neutral to everything, thus they don't get put into a class.
Elemental > Mineral > Nature > Body > Spirit
Every Pokemon has a class and a single type.
A Nature-Class mon will get a 1.2x boost in Ground, Flying, and Electric moves, but will take 1.2x damage to Psychic, Fighting, and Poison.
A Fire type mon will get a 1.5x boost in Fire moves, but will take 1.5 damage to Water.
Original type compatibility be damned. No type is superior, no type is inferior.