"What types have the most coverage? (or what types are the most necessary in a game)"

Usually when i start a game i try to get Fire, Water, Grass, Electric, Rock/Ground, and Psychic (while incorporating flying and maybe fighting in there as a dual type) and this has worked out for me in most games. But i was wondering if anyone actually KNEW what types on a team would have the MOST coverage (ie if i were to encounter a pokemon, id have a pokemon on my team thats effective against it) via /r/pokemon https://ift.tt/3Lf82AH