Once you have gotten data on 50 pokemon in your pokedex, go to fuschia city and exit through the Eastern path. In the little police hut there will be some stairs, go up and claim your reward from Prof.Oak's aide!
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An oak aide in a big building east of fuchsia city has exp share you need to record 50 Pokemon in your pokedex and show him that, he gives you exp share for your accomplishment.
no, except you get one from your friend or use some gameshark code
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.
Once you capture 50 different Pokemon or own 50 different Pokemon you can go east of fuchsia city and go inside the big building and go upstairs and talk to the scientist say YES to his question to get exp share.
First capture or own 50 different Pokemon, Second go east of fuchsia city and go in the big building go upstairs and speak to the oak aide show him you caught or have owned 50 different Pokemon to receive an Exp Share.