I'm sure you can find it on its own, but you can obtain more Pokemon in your pokedex and I personally think its easier to get the pre-evolved form of that Pokemon. ( I just can't remember right now what its name is.)
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Slugma evolves into Magcargo.
You'll need to evolve it from Slugma at level 38.
you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald
You cannot find an infernape in Pokemon emerald for that Pokemon you need Pokemon platinum, pearl or diamond.