can someone answer this please i gave one of my pokemon proteins, hp up, carbos etc until they wouldnt effect anymore but after a couple of weeks i found i could give the pokemon some more proteins etc. do pokemon lose attack,defence,speed etc after a while or can you add extra to it after a while

those medicines boost your EVs; so if you used an EV-reducing berry on those pokemon, theoretically, you could use the medicines on them again.