Clay uses Ground-type Pokemon. Therefore, you'll want to bring water, grass, or ice-type Pokemon to the gym.
Driftveil City. Gym Leader Clay!
it is at driftveil city
Clay is at the Driftveil City Pokemon Gym.
In Pokemon platnium it is wake gym leader. P.S. he has water type Pokemon.
The 8th gym leader is Drayden he uses Dragon type pokemon
The fourth gym at Pokemon fire red is grass type gym
fighting types, the gym leader is chuck
You get from Bianca after you beat the Driftveil Gym then go to route 6 just out side of driftveil
the 15th gym leader in soul sliver is blaine and he uses only fire type pokemon
Poison type pokemon, other trainers in the gym also have psychic but again the leader has poison type
There are different types of gym leaders and each gym leader has a different pokemon type.
top right corner of the city