Why do gym leaders and elite 4 members all use the same type

>>32837952
>Why does it take the player to realise that if you just diversify your team you can beat monotype teams easily?
maybe that's the point.

>>32837952
Some people just really like one type.

But from a gameplay point, it's more or less a test for players to know type matchups.

>he doesn't use 6 normal type pokemon

>>32838011
>He doesn't solely use his starter, only catching other Pokémon for HMs

>>32838039
He doesn't use his level 90+ starter, box legendaries, and severely underleveled HM slaves