After Gary got his Pokémon healed he called his parents back in Cianwood. "Hi mom and dad! I made it here safely and am beginning my quest to get all the gym badges in a minute." Gary's parents were very happy to hear that and his dad quickly answered. "That's my boy! Start your own gym just like your old man!" Chuck yelled out. Gary smiled at his dad's behaviour before hanging up and making his way to Brock, slightly nervous but confident in the abilities of his Pokémon and himself.
"Welcome challenger, my name is Brock and I will test you to determine if you are worthy of the Boulder Badge. Bring out your Pokémon!" Brock exclaimed as he sent out his Geodude. "If you fall, use that as motivation to grow stronger! Go Tyrogue!" Gary sent out his Tyrogue who was ready to fight anything and anyone.
"Tyrogue, Fake Out!" Tyrogue leapt forward and slapped Geodude, doing little damage but causing it to flinch.
"Smart move, but it won't save you from losing next turn." Brock stated.
"Tyrogue, Bulk Up!" Tyrogue tensed his muscles, building up his attacking power and defensive power.
"Geodude, Tackle!" Geodude tackled Tyrogue, doing less damage than expected due to Bulk Up raising Tyrogue's defense.
This kept going for six turns and Tyrogue was battered before eating an Oran Berry, healing most of his HP.
"Now let's see if your parents taught you how to use this! Mach Punch!" Tyrogue launched forward with his fist extended, causing Geodude to barely hang on with 1 HP.
"Geodude, Tackle!" Geodude attempted to tackle Tyrogue but missed and got hit in the back by another Mach Punch, taking it out.
"Not bad, but let's see if you can take this out! Onix, go!" As Brock returned his Geodude, a towering Onix appeared in the field causing both Tyrogue and Gary to gulp in fear.
"Come on Tyrogue, Mach Punch!" Tyrogue caught Onix off guard with his sudden speed and landed a critical hit, taking the Onix out.
"You did it Tyrogue! High five!" As Gary and Tyrogue high-fived eachother, Brock returned his Onix and walked over to Gary.
"Well done young challenger, you are indeed worthy of these items." Brock gave Gary a Boulder Badge and a TM for Bide. Gary thanked Brock for the fight and left the gym, aiming to get through Mt. Moon before it got dark.