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.
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Go to lake of rage north of Mahogony town and you`ll find out the rest by yourself
you go to the lake of rage and Battle the SHINY gyrados and then you will get it
If you mean an Exp. Share then you go to mr. Pokemon's house at Rt. with the red scale you should have picked up after battling gyrados. He will take it in return for an Exp. Share
The red qyrados is just a shiny grados and u can get gyrados when fishing with a good/super fishing rod imn Sinnoh
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