You can get an Exp. Share from the chairman at the Pokemon Fan Club in Iccirus City.
go to the bike path at eterna city
You can get it on Route 15 in the guard house from Professor Oak's Aide after you have caught at least 50 Pokemon for the Pokedex.
on th bike path heading south before you go out of the little border or watever there is a guy that gives it to you if you've seen 30+ Pokemon
So, when you head out from Eterna City to the cycling road, you will enter a room with two women. In the room, there will also be a scientist. Talk to him and you'll get the EXP share.
If you have Pokemon White Virsion then you can in white forest, if you have Pokemon Black Virsion then you must trade it from Pokemon White
how to get exp.share in pokemon blue
If you give a Pokemon not in battle an Expshare, the half of the experience points will go to that Pokemon. If you're in a double battle, and one of the Pokemon in battle has an Expshare, 3/4 of the experience points will go to it. It's a very useful item for training weak Pokemon.
go to mr stone
first go to Mr. Pokemon first have the red scale and he will give you it
go to the bike path at eterna city
Simple, Give it to one of your weak Pokemon that you want it to be strong.
In the Big building to the right of fuchsia city.
In Castelia city.. Is in one of the buildings last floor
Prof. Oak's aide will give you the item if you have more than 40 Pokemon at Route 11.
You can find the Exp. Share in Rustboro City or in the Lilycove Dept. Store.
Talk to Mr.Pokemon after you get a red scale from the red gyarados
Exp ShareWhat it does: Shares exp earned with the Pokemon you attached the item to.Pokemon(s) that hold this item:WynautWobbuffet