Go to lavender town and toward the bottom there are two houses go to the one on the right. this is the name rater. Be aware that any Pokemon you got in a trade with a nickname is stuck with it because the name rater will only say something bout the previous trainer choosing that name specific. Also when you catch a Pokemon you have an option there too (this is changeable)
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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
It depends on the pokemon.