Yes, after you defeat the Elite Four, and then help Celio find Ruby and Sapphire (gems, not the characters ;) , he'll give you the Rainbow pass. There is a Daycare couple on Floe Island (Four Island). When you leave two Pokémon in their care, they breed depending on their egg compatibility.
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yes
Its not on fire red it's on leaf green murkrow is on fire red version
No.
No there is not.
You can't find a Vulpix in Pokemon FireRed version. That pokemon is version-exclusive to Pokemon LeafGreen.