yes you can
It is at the Lake of Rage in the middle of the lake. You will have to surf to catch it.
Get surf and get a life
To get past the "Lake of Rage Dilemma", you have to surf out to the Red Gyarados and either capture it or defeat it. Then surf back to shore and Lance, the champion, will tell you what to do from there.
Surf around Lake of Rage
go to the lake of rage to get to the lake of rage you need to go to mahogany town then go north at the center of the lake is the red gyarados
You find it at the Lake of Rage. You need a Pokemon that knows Surf to get to it.
Easy... Look on your pokegear map and follow the path to it. If you have surf you can catch a shiny garados
Get surf then go to the sea of rage and swim to the middle of the lake and battle it.And TRY to catch it
go to the lake of rage with surf and you see a red gyarados talk with him and you can cath a shiny gyarados
you get surd from beating all the kimoto girls in this house. they each have an evolution of eevee. when you defeat all of them talk to the guy and he'll give you surf
You must go to maghoney town.. where the lake of rage is . You must have a Pokemon that learns surf. But before you can enter the lake of rage. Two team rocket grunts will make you pay 1k of gold to enter the lake. Once you pay your gold you will enter the lake of rage. There will be trainers looking for a battle in the lake of rage so be prepared. Keep going straight until you see water that you can use surf. You should see a red garaydoese (Magickarp's evolve form.) there. Defeat it or capture it and that Pokemon shall drop the red scale. I will recommend you not throw trade or sell that red scale. you can get groudon later with it.
they are not at the lake of rage they are on your way there