If I were a Gym Leader....
I think my speciality would have to be..the Fire type.
My team would be:
Darmanitan
Volcarona
Heatmor
Chandelure
Emboar
This could be the 8th gym.
Or if I were the first Gym Leader..
Litwick
Darumaka
The badge would be the Scorch Badge and it comes with the TM Flame Charge.