You can get the experience share two ways. First would be to go to Castelia City and go into the Battle Company which is in the front of the city right after the Pokemon center. Just go into all the buildings until you find it. You should be greeted by a man and then you can go up to 2 floors and battle trainers. Once you beat all the trainers and the man that greeted you he will give you the Exp. Share. Another way is by going to Icirrus City and going through the houses until you find a man that will ask you to show him a Pokemon that leveled up 25 levels since you caught it. So show him your starter since it should be above that and you'll get your Exp. Share. Hope I helped!
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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 can either get it in the game, which apprently you CAN in pokemon black and white. And just as the previous contributor said, You can trade with your friend and then BAM! You get an experience share!
You give the red scale from the shiny gyarados to mr Pokemon
There is no exp share, but there is a lucky egg which really helps leveling up pkmn The experience share can be found in two places. One is castelia city. You go to floor 55 of a sky scraper with a green roof, defeat the janitor, and he'll give it to you. The 2nd one is a gift by the Pokemon fanclub host. You have to show him on of your Pokemon, then level your Pokemon up 25-49 more levels. He will give you the 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.