you need to catch a gold magikarp(shiny) by fishing or breeding then level it to 20. Or you can catch a red gyarados(shiny) by random. The chance to have it red are i in about 8000
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It exists only in Johto. Its just a shiny Gyrados. Fish for Gyrados, in 10, 000 tries you are sure to get one. That's how rare it is.
if you mean exp. share the catch the red gyrados and trade the red scale to mr Pokemon
You have to go to the Lake of Rage. In the middle of the lake, there is a red gyarados. This is your only chance to catch the Red gyarados, so save before battling it to have multiple chances to catch it.
Go to lake of rage north of Mahogony town and you`ll find out the rest by yourself
catch a magikarp and evolve it