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Chimchar does not need a stone to evolve, it evolves at level 14 into Monferno.
You cannot catch Chimchar in the wild in Pokemon Pearl. You can only get chimchar either at the beginning of the game, or breeding a chimcharm, infernape, or monferno. Otherwise, you need an Action Replay to catch a chimchar in the wild.
i think 10000 steps it need to hatch
in order to hatch a riolu egg you need to walk about 5,000-6,000 steps
you need to migrate it from Pokemon diamond/pearl/platinum. it is unobtainable in soul silver/heart gold trade, not migrate