U have to catch it. If u don't, of course u didn't get it. Plus, did u make sure it was the RED guaradose? That would help, if u COUGHT the RED guaradose. Or, if u DID catch the RED guaradose, then I don't know what to tell u. Sorry :(
When you battle the Red Gyrados at the Lake of Rage, it will drop a Red Scale, whether you capture it or not. Take this Red Scale to Mr. Pokemon (the man who gave you Togepi's egg), and he will offer you an Exp. Share in exchange for the scale. The Red Scale has no other purpose, so you may as well do so. If you do not remember where Mr. Pokemon's house is go North of CherryGrove City you will be on route 30, keep heading north until you get to his house which will have a PSNCRBERRY tree next to it.
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
You have to deliver the letter to Steven in Dewford, then you should go back to the president in Slate-port city where he will thank you for delivering the letter and rewards you with the EXP-Share.
When you get to Blackthorn City go to the move deleter's house there are two in the front one is the move deleter and the other is the move restorer give him a heart scale and he will teach your pokemon a move was alredy deleted
After two days competing in the pokeathlon in the poke dome it was available to me for 1000 points
you go to the lake of rage and Battle the SHINY gyrados and then you will get it
you get one from mr Pokemon if you show him the red scale (red gyrados) and 1 from professor oak
Mr. Pokemon's house. After catching (or defeating) the Red Gyrados you get a red scale. Give it to him, as it is otherwise useless.
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
you get the gyrados scale after defeating or capturing the red gyrados,then if you show it to mr pokemon,he'll trade it for an exp share
The Red Scale item is not obtainable in Pokemon Pearl. This is because there is no event in which to obtain the Red Scale. Additionally, since the Red Scale is a Key Item, it cannot be held by a pokemon, an thus it is unable to be traded from HeartGold or SoulSilver, where it is obtainable.
beating / catching the red gyrados in the lake
get the red gyrados at lake of rage
you trade it for your red scale to mr. Pokemon
You don't need it you just have to defeat it you will still get the red scale and talk to lance but wouldn't you want a shiny red gyrados everyone wants shiny rare Pokemon
mr. Pokemon
You must collect the Red Scale (I Believe from The Lake of Rage after the Red Gyrados has been defeated or captured.) and then give it to Mr. Pokemon (You had to go to his house and find Professor Oak @ the beginning of the game.)