There are new events that are unlocked after you beat red. there is no other "main storyline".
use some lvl 100 Pokemon or use really effective moves
If you beat the red Gyarados, I don't think you're able to fight it again. Unless of course, you run into another red Gyarados by chance.
You can get the exp share as soon as you can go to the Lake of Rage. Once you obtain the red scale from either beating or catching the Shiny [Red] Gyarados, give it to Mr. Pokemon and he will give you the exp share.
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
in soulsilver you get the red orb in heartgold you get the blue orb
You must get the red scale from the Red GYARADOS in the lake of RAGE where leader Pryce is. Then take the RED SCALE to the Pokemon PROF. He will give you an Experience share in return
A Magikarp can evolve into a red Gyarados. The Magikarp needs to be a shiny Magikarp in order for it to evolve into a red Gyarados. This is due to the red Gyarados simply being a shiny Gyarados.
it dissapears and you get a red scale but once you beat the elite 4 you get to challenge it
Obtain the "Red Scale" from the Red Gyarados and take it to Mr. Pokemon. (the man you receive the Mystery Egg from at the beginning of the game)After you beat or catched the red gyarados, you get a red scale. You can trade it for a exp share by Mr pokemon!
In The lake of Rage in Soulsilver/Heartgold
There is only one in the game.It is gone if u beat it.So just save before fighting Red Gyarados so that you can fight it again if u mess it up.
Talk to Mr.Pokemon after you get a red scale from the red gyarados
after you beat or catch the red gyarados he will drop a red scale
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.
Here are two ways to get Shiny Gyarados (Red Gyarados):Trade the Shiny Gyarados from Pokemon SoulSilver/HeartGold that you have gotten in the Lake of Rage to Pokemon Diamond.Fish or swim in the area where Gyarados spawn vastly. However, this is the longest way to do it, because the shiny rate is 1/8192. I'd recommend trading from SoulSilver or HeartGold.
gyrados ,and if you can get it,red gyrados.happy to help!
after meeting lance and defeating team rocket and the red gyarados
Nothing really, its just pretty rare especially to other games like platinum, diamond and pearl. Its just a shiny gyarados
Beat Red