>>31985789>Drag usefulness downBug, Grass, Psychic
>Make it incredibleRock, Ice, Fairy, Steel, Poison
Rock or Ice STAB coverage is great offensively because there aren't a lot of Pokemon that can safely switch in on a dual type mon with one of those types, see Mamoswine, Weavile, Tyrannitar, etc. If only there were more fast Rock types and Ice types
Fairy is a pretty great secondary to have for defense, and with the rise of Fairy, Steel and Poison made a rise in usefulness as well.