Yeahh I had experience like that,My friend had pokemon sapphire,I was checking his pokemon and he had a green marill,I passed it and I was like oh s*** that was a shiney!!! I was so ecsited,The only shineys I ever had was a shiney seaking in silver,I wanted one so bad in this generation,so I asked him if I can have it,I said I will trade him *anything* for it,he then said why do you want it so bad? I said becuases its cool,I lied to him I said it was sick and will never evolve (he is a pokenewb) he said ok that he will trade me later,I then told him the reall story about shinies and he wanted to keep marril...a day later I asked to see his game,he told me he traded the game for som other garbage gba game...i was so mad...i think the game was hotwheels T~T