behind your pokemons
if you mean the medicine for 'amphy' in the light house, go to the medicine man in cianwood city he will give you a 'secret potion'
Given to you by a man on route 36.
go to cianwood city and talk to the man in the pharmacy(it's the house next to the sign)
man who is mr.fuji
In Pokemon platinum you must find all the Pokemon in your game to be aloud past so it should be the same in your game
A man in Ilex Forest
speak to the man with the running shoes
route 28 at 5:00 it sould be a man u battle then he will run away and riolu
Inside a house at Blackthorn City you'll find the move re-learner man
catch a sandshrew~
there is a man in the Ilex Forest that will teach headbutt to as many Pokemon as you want
you have to beat team rocket and talk to the man in the dojo