You can't without using cheatcodes.
The Old Sea Chart is only obtainable and useable in Pokemon Emerald.
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You can get it in Vermillion City in the house that is next to the Pokemon Center.
If you have Fire Red in your DS, go to the Old Chateu.
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.