Earthbadge

Location:
Viridian City, the gym with the locked door. It will unlock after you beat him in the Silph Building.

Pokémon:
Rhyhorn Lv. 45
Nidoqueen Lv. 43
Dugtrio Lv. 42
Nidoking Lv. 45

Tips:
Grass, Water, Ice, Ground, and fighting are the best against him but Normal, Fire, Poison, and flying are the worst. All others are fine also.

Rewards:
TM 47 and ALL POKEMON WILL OBEY YOU!!!