You can catch Heracross at around level 30 in pattern bush on one of the sevii islands. I don't think he's too rare.
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Spinarak, heracross, weedle, caterpie.
No there is not.
you can not find him not 1 persent
You can't find a Vulpix in Pokemon FireRed version. That pokemon is version-exclusive to Pokemon LeafGreen.
Moltres is in Mt. Mortar