Dragon/Steel: 11 resistances, 1 null damage but has 2 weaknesses
Not only that but dragon types tend to have very open move pools. Were talking stuff like Thunder, Thunderbolt, Flamethrower, Fire blast, Earthquake, Stone edge ( Especially since its part steel and they tend to all have that too ) and water moves. Dragon types are naturally built for offensive purposes. So a Dragon / Steel pokemon would likely have incredible coverage and incredible defenses.