In the sinnoh region you can find a Gyrados almost anywhere. In Emerald the only 100% is Fishing w/ Super Rod in Sootopilos City.
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catch a magikarp and evolve it
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
if you mean exp. share the catch the red gyrados and trade the red scale to mr Pokemon
Go to lake of rage north of Mahogony town and you`ll find out the rest by yourself
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.