Raise your charmander to lvl. 13 and it will learn metal claw. Use Metal Claw to defeat Brock since it is super-effective against rock-type Pokemon.
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You may need to level up your bulbusaur to level 16 then retry to beat charmander, try catching other Pokemon to fight charmander that are not grass types, advice get a geodude.
Charmander doesn't appear in the wild in Pokémon Pearl unless you cheat or hack the game. To get a Charmander in Pokémon Pearl, beat the game and migrate one from Pokémon FireRed, LeafGreen, Ruby, Sapphire or Emerald, or get the National Pokédex and have a friend trade his/her Charmander.
try to evolve it into charmeleon and crush brock with its metal claw. and prepare to bring potions just in case
After you've beaten Brock go beat the other six leaders then you can fight Blue
Yes, after you beat Red go talk to Professor Oak and he will give you a choice of Charmander, Bulbasaur, and Squirtle.