Firstly have a pokemon which has fly and a pokemon with surf. then once you have the master ball put it in the 6th slot of ur items. then fly to viridian city. then save the game. talk to old man who has had his coffee, when he asks if he is in an hurry say no and watch him catch a weedle. then fly to cinnabar and swim up an down the east coat (on the right). eventually you will get into a battle with #m# (missingo) which looks like a computer chip DONT CATCH IT WILL START TO DELETE THINGS OFF UR GAME or with mew two if you do encounter mew two you have to turn ur game off because u cant beat it thats why u have to save ur game before. if u do encounter missingo jst run then check ur items u should have 9 and a wierd symbol this shows has worked. u can also do it with other items like moonstone or gold nugget and sell them for money to become rich!!!!!!!!!!!!!!!!!!!!!!!! thank you and goodbye! any questions message me u may not getc an answer for a while