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what starter did you pick?
what other pokemon do you have?
see if you picked bulbasaur or squirtle you should have no trouble beating brock
just level up you starter to like level 18 and bingo you have beat him
Well, I would first recommend catching a Mankey, seeing as fighting types are good against rock types. Also, make sure Charmander knows Metal Claw, as that can come in handy if you need to have Charmander as a back up. Next, level up your Pokemon to around level 15-20, and then you should do fine. I would also recommend buying Potions, afterall, you can never be too careful. Good luck on beating Brock! ^_~
Metal Claw and Butterfree can't go amiss. Train Charmander up until it evolves and learns it. Catch a Caterpie and train it until it evolves and learns confusion. That was the only way to defeat Brock in Yellow, but with the help of Metal Claw, you should be fine. Just make sure your Pokemon are higher levels than Brock's Pokemon. ^_^
I started with a Charmander too, and since they seem to be a bit vague, here is my advice. First, make sure you have a butterfree that knows confusion. That'll help. Raise Charmander up to about level 14, and it will learn Metal Claw. That move will be super effective, but at the same time your charmander will be a victim to their ground type moves. A mankey would be a good idea, although i myself didn't have one when I faced Brock. Still, those three will be your best bet. And good luck with MIsty afterwards. Trust me, you'll need it.
I recommend haveing charmander at about 15, that is the only pokemon i used (since im trying to beat the game with just charmander) and using ember, even though metal claw is super effective i find ember is stronger