At Route 15 inside the big place, go upstairs talk to Professor Aid. If you have collected at least fifty Pokemon, he will give you the Exp. Share. The Pokemon holding this item will gain the exact same number of experience points. For example, if Magikarp is holding it it and your Charizard just went up to level 59 and the experience was 496, then Magikarp will gain exactly 496 points.
if the Pokemon came from a trade it will get more experience points than your charizard.
Edit: Not sure about traded Pokemon, but the one holding the Exp. Share will get exactly half, so if you use 2 Pokemon in the battle, and the total exp is 1000, your Exp Share Pokemon will get 500, and the other 2 will get 250 each.
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You get the EXP. share from the president of something in Rustboro City when you are going to deliver a message to Steven and someone else.
Well, you give it to a Pokemon in your party. Then when any other Pokemon in your team defeats an opponents Pokemon, the Pokemon with exp share gets part of the experience points you get for defeating the opponents Pokemon. e.g. You give the exp share to charmander your Blastoise defeats a Zubat. You get 500 exp total, whcih is divided between charmander and Blastoise.
The best way is challenge the elite four with your Pokemon or a Pokemon holding exp. share. The better is to use gameshark codes for rare candies.
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.
to obtain 5,ooo exp in Pokemon leaf green is to put a expirance share on the Pokemon you are training (best place to train is Pokemon league or victory road or clearun cave)