You can't. However, Chimchar can be found in Pokemon Diamond, Pearl and Platinum.
it is impossible
You can get a Chimchar if you trade it from games Diamond, Pearl, and Platinum.
trade from pearl, diamond, or platnium
A Chimchar is a starter Pokemon and can only be found in Sinnoh
You cannot get Chimchar, Monferno, or Infernape anywhere in HeartGold or SoulSilver. You will have to trade over a Chimchar from Diamond, Pearl, or Platinum.
You must migrate it from Diamond/Pearl/Platinum/Heartgold/Soulsilver.
you cant see a chimchar in Pokemon diamond so you are saying that no trainer in the game has a chimchar
Well for me, I got my brother (he plays pearl) to trade me a chimchar egg. Then I hatched it, and evolved my chimchar twice. Tip: Chimchar to monferno= lvl 16. Monferno to Infernape= lvl 36.
Go to the desert and walk around until you see a chimchar
trade
you dont get girl chimchar in heartgold or soulsilver you can trade from either platinum, diamond , or pearl and up my bum!
well if you chose chimchar then you will probably make it envolve. and there is a trainer with a monferno anyway.