If you play a pokemon game, you have to defeat 8 gym leaders, the elite 4 and the champion, to become the champion. the gym leaders and elite 4, all have a type they specialize in. like fire or fairy. the champion has a type diverse team so pokemon cover eachothers weakness. under the catagory there are:
Lance, Steven Stone, Wallace, Cynthia, Alder, Iris, Diantha, the Sun/Moon protagonists, Leon and gita, in order of their respective games.