You change the red scales with mr Pokemon and he will give you the exp share.
You give the red scale you get from the lake of rage to the guy who gave you the togepi egg in the beginning of the game, and he will give you the exp share.
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Its a item that you give to a Pokemon and it gives the Pokemon that you gave the exp share to exp points to help a Pokemon gain levels
You give the red scale from the shiny gyarados to mr Pokemon
Use the experience share item and attach it to a pokemon that you want to gain exp. Also if you start with the weak pokemon and swap out for a stronger pokemon, then half the exp goes to each pokemon
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
If you take the red gyarados scale to Mr. Pokemon (The guy who gave you the egg at the beginning of the game), he will trade it for the experience share.