Either you already have it (it's a key item), or you have to beat the gym leader.
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they have all ready been taken
in what Pokemon? in Pokemon ruby/sapphire and maybe emerald too, a girl in slateport contest house give it to you
it isn't the Pokemon league the Pokemon league is at the end of route 223
this will be tricky u need to fight the peltburg city gym then youll get the coin CAUTION if you use it alot it wont work anymorto get a amulet coin ypu must talk to one of professor oaks allies and you must catch 40 or more diffrent pokemon and you talk to him and he will give it to youhes where you catch sorlax in celadon where the grass gym leader is
you need to raise your blastoise's friendship to MAX. to do this you can: LV.UP give it vitamins such as: hp up, carbos,zinc,calcium,or protein. you can get your pokemon massaged by daisy ( gary/blues sister) until the lady lets you. It works!