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.
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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
give the exp share to a weak Pokemon when you use any Pokemon to fight exp goes to the fighting Pokemon and the 1 with the exp share.
Yes. I forgot where, but you do get it.-
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
Yes. Give a red scale to Mr. Pokemon and he will give you EXP Share.