>>29392442>WrongSorry, meant Pearl, but you get the idea. Lots of Gyms that use pokemon outside a specialty.
>Uses a Gyarados the same reason Lance does. Limited Dragon Pokemon.The Elite 4 all use pokemon of multiple types even when there are more than enough, though..
>>Striaton GymBut there is no reason to use Pokemon that had only been available until then. Onyx in Red/Blue only shows up until after the third Gym.
And judging by the way some Pokemon appear to drop levels between games, or others seem to drastically level up in a short time, It seems rather obvious that Gym Leaders have multiple teams. So the weak ass mono-teams are probably used against newbies to teach them about Pokemon types, while the real teams used against powerful trainers can have whatever they want.