ITT think of a Gym Leader. OK? Now give that Gym Leader a competitive team based on how many Pokemon he has. Brock from Gen 1 has 2 Pokemon:

Geodude: (Sand Veil) (Earth Plate)

>E-quake(STAB)
>Stone edge(STAB)
>F-punch(Covers Grass and Ice)
>T-punch(Covers Water)

Onix: (Sturdy) (Choice Band)

>Stealth Rock
>Dragon Tail
>Protect
>Stone Edge