If you mean the old version, Pokemon Red, and not Pokemon Firered, then the only place that I can think of that have tons of fire Pokemon is the mansion on Cinnabar island. Go inside and walk around. You should find a lot of Ponyta and Vulpix, if you're playing Pokemon Blue, but if you're playing Pokemon Red, you'll more than likely find Ponyta and probably Growlithe. I'm not sure if you can find Vulpix in Pokemon Red or not. But, that's where you will find a lot of GOOD fire Pokemon. And, of course, Moltres is hidden away in Victory Road.
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You cnnot catch it in Pokemon fire red ,but you can catch it in Pokemon Diamond and Pearl.If you want it to be in your fire red,you will have to migrate it from your Diamond/pearl to your fire red.
You can't catch it on Pokemon Fire Red. You have to trade it from Leaf Green.
Tangela does not evolve in Fire Red.
no
yes