Hello, I'm going to assume you were freekhoorn2 asking the type question in the help chat today. I created a program to calculate the set of all 2 pokemon that resist all types (including abilities) and the result was every aegislash evo (and kitsune, the CAP) paired with hydreigon. No other groups of 2 pokemon resist all types. Because I hate myself, I also extended the search to all groups of 3 pokemon.