first catch a jigglypuff at the route just east of pewter (just after all the trainers)train it until its speed stat is 25 or more DO NOT DELETE SING.next walk accross nugget bridge then go left DONT FIGHT THE TRAINER IN THE GRASS YOU'LL NEED HIM LATER next fight abra and put it to sleep with sing to catch it then walk in front of the trainer and as soon as you do press start go on pokemon and use abra's teleport the trainer will notice you and you'll teleport befor you battle at this point your a, b, and start buttons are disabled walk back across the bridge and go east again fight the trainer facing up with a lvl 17 slowpoketeleport again and walk the bridge for the last time and the game will pause (and a man will appear in the water next to you)press b to unpause it andd yo'll fight mew lvl 7 it only knows pound.