I believe you get it from a man called Steven in the Silph co. building in Saffron city, Kanto, choose the red stone and you will receive Chimchar.
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You can get a Chimchar if you trade it from games Diamond, Pearl, and Platinum.
trade from pearl, diamond, or platnium
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.
Pick Piplup or Chimchar and then trade for a piplup or chimchar
CHIMCHAR