I wonder why the original Diamond and Pearl didn’t have that many Pokemon in the game? Like some Gym Leaders and Elite Four members didn’t have Pokemon that were the same type as their teams like with Volkner and Flint

I wonder why the original Diamond and Pearl didn’t have that many Pokemon in the game? Like some Gym Leaders and Elite Four members didn’t have Pokemon that were the same type as their teams like with Volkner and Flint

by Ok-Leave3121