Gym Leader #1: Brock - Pokemon Red and Blue

Gym Leader #1: Brock - Rock

Brock has two Pokemon; Geodude & Onix. His gym is extremely simple, you just need to walk up to Brock, you don't even have to battle the Jr. Trainer.

Geodude
Level: 12
Types: Rock/Ground
Attacks: Tackle & Defense Curl
Weakness: Ice, Ground, Fighting, Water & Grass
Strategy: Hit it with a Water or Grass Type Attack.

Onix
Level: 14
Types: Rock/Ground
Attacks: Tackle, Screech & Bide
Weakness: Ice, Ground, Fighting, Water & Grass
Strategy: Hit it with a Water or Grass Type Attack, but when Onix uses Bide use a non-attacking move other wise you will get hit with twice the damage you gave.

Once you defeat Brock, you will get TM 34 Bide and the Boulder Badge.

Brock