yes. you may find them at: Cerulean City Five Island Water Path Cerulean Cave
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You can't. You can only find a PP Up
You must give to them pp up, carbos.iron and other things
i think that it is in the Pokemon mansion
Have six Pokemon w/ pickup ability in party, battle lots of wild Pokemon. after each battle each Pokemon has 10% chance of holding item including PP up. More Pickup info at http://bulbapedia.bulbagarden.net/wiki/Pickup_(ability)
You can win pp up from the lottery at lilycove city.