You fish for it in the town the third gymleader is with a super rod.
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Shellder is a version exclusive Pokemon only found in Fire red. But, Instead of Shellder, you can get Slowpoke, if you use a good rod in the Vermillion city harbor.
Shellder can't be found in the wild in Pokemon leaf green, you would have to trade it from fire red.
Pallette Town with the Super Rod. (Yes, you need the Super Rod in Fire Red.)
You can't find a Vulpix in Pokemon FireRed version. That pokemon is version-exclusive to Pokemon LeafGreen.
No there is not.