A red Gyarados, or into simpler words, a shiny Gyarados, has red skin instead of blue skin. You cannot really find a red Gyarados in Fire Red, but what you can find is a shiny Magikarp. I suggest this:
1) Make sure you have an Old Rod.
2) Go/Fly to Vermilion City (the place where the S.S. Anne left).
3) Register your Old Rod, and start fishing for Magikarp.
*A Shiny Magikarp will be a gold-ish color, so make sure you look closely before running from the battle. If you happen to run into run, but then flee, well... good luck finding it again.*
4) When you get the Shiny Magikarp, train it until it evolves into a Gyarados, at Level 20 I think. The Pokemon will still be shiny, so it will be a shiny Gyarados/Red Gyarados.
5) Have fun with your Red Gyarados.
WARNING: This procedure seems to be easy, but it is not. The hardest thing is being very patient. Shiny Pokemon do not come commonly (no pun intended). When I got home from school, I started fishing for a Shiny Magikarp, and now I STILL do not have one. It may take you weeks, months, or even a year to catch a Shiny Pokemon/Magikarp. It all depends on luck.
But if you REALLY want one, you can just hack, which isn't recommended. I heard it messes up your game. Anyways... Good luck on catching and evolving your Shiny Magikarp!
Hope this helped!
~Katie
I don't think there is a red Gyarados in Pokemone Fire Red. I'm having trouble finding a regular one too. I think there's a regular one in Cerulean Cave where you capture Mewtwo. Actually, I also have a red Gyarados on my Pokemon Fire Red Version game. Mine is level 51 and quite strong. I've never even heard of a gold gyarados! its in mystery dungeon the thing you call cerulean cave in the beginning.
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khadels backyard
No, Gyarados and red Gyarados are basically the same having only one key difference; red Gyarados is a "shiny" Pokemon which changes its color and makes it rare to find in normal gameplay.
Yes, the "Red Gyarados" is actually just a shiny Gyarados.
While it was possible to find missingno. in Red version, it is not possible to find it in FireRed.
It is not possible to get the Red Gyarados in Pokémon Yellow version. You can only get it in Gold, Silver and Crystal version.