Yes, you can get it from Dawn's/Lucas' father at the building between Eterna City and cycling road.
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you could switch Pokemon in battle then all Pokemon that battled get exp or you could get the exp share and give it to one of your Pokemon
Once you get 35 Pokemon in your PokeDex, Prof. Rowan's aid will give you the Exp. Share in Eterna City's gatehouse.
An exp share allows you to share exp with another Pokémon. You can get it in Pokémon Diamond Pearl and Platinum near Eterna City.
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.
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