Spam Metal Claw and Potions

Luckily, your Charmander had evolved into Charmeleon and learned metal claw, letting you actually affect Brock's rock type Pokémon. You continually use metal claw, healing when the need arises, and eventually, his final Pokémon, Onix, falls. You are awarded with the Boulder Badge, your first gym badge, along with a stack of cash. Content with your victory, you leave the gym, ready to head onto route 3.