>>52096874At this rate, ghost/rock. Poison/ice, fairy/ground, fairy/fire and bug/dragon aren't hard at all, and the normal combos just require them saying something has "normal energy" as opposed to being a pure elemental. Hell, normal/steel has an honorary "pokemon" already.
Ghost/rock seems to be the focus of their retardation for whatever reason, a type combo they refuse over and over. But electric/fighting finally got added this gen (as underwhelming as the mon actually is), so there's hope for ghost/rock.