Ch 4:

Tristan is in Pewter City and is about to enter the Gym to battle Brock but sees a sign outside the gym saying the gym is for rock types and that you need to battle 2-on-2. Tristan knows Beedrill is weak against rock types so he decides to go to the outskirts of Mt. Moon and catch a rock type. Tristan goes to Mt. Moon and fins a Geodude just outside the cave. He battles it and it defeat Phanpy with Tackle and Rollout, which surprises Tristan. Tristan throws a Pokeball at it and manages to catch it. Tristan then scans Geodude with the Pokedex and learns it knows Rock Slide and Defense Curl. Tristan goes to Pewter Gym and challenges the Gym Leader Brock to a battle. The Gym Leader comes out of the shadows and reveals his name is Brock and he is the Gym Leader of Pewter City. He then says he deals in Rock type Pokemon and gives out the BoulderBadge to trainers who defeat him. Tristan and Brock takes sides on the arena and throw out their first Pokemon, Phanpy and Geodude. Brock has Geodude use Tackle which hits Phanpy harder than Tristan anticipated. Tristan has Phanpy use Rollout but Geodude manages to grab phanpy when it goes in for the hit and uses Rock Throw to toss a rock at phanpy and send it sliding across the arena into a rock, where it is unable to battle. Tristan scratches his head at the defeat but sends in his Geodude who dodges a Tackle and uses Rollout to knock Brocks Geodude out. Tristan is impressed at his Geodudes power until Brock throws in another Pokeball to release the gigantic Onix. Tristan scans the Pokedex and Onix is revealed to know moves more advanced than Geodude. Geodude uses Rock Throw but Onix bats the rocks away and uses Bind to grip Geodude and squeeze the life out of it. Geodude uses Rock Slide to send a barrage of rocks onto Onix which lets it go but Onix uses Screech to throw Geodude back onto the rocks in the arena and knock it clean out. Tristan puts his head in his hands and returns Geodude. Brock says Tristan will need to fight better and develop a tactic rather than going straight in for the attack all the time. Brock then disappears into another room leaving Tristan to exit the gym himself.