You have to have access to lavender town and travel to the top of the ghost tower. There, defeat cubones mother and the team rocket guards on top. Then an old man will take you to his house. talk to him and he will give you a blue Flute. approach snorlax and press A and the flute will wake him up. he does attack
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east of vermilion city, just under diglett cave (you need to get rid of it to advance to pewter, veridian, pallet and cinnibar)
First you must clear the memorial cemetery in Lavender City. After you free Mr. Fuji he will give you a pokeflute. You can use it an infinite amount of times. It wakes up sleeping pokemon so there will be no need to buy awakening after you obtain it. By the way in order to clear the memorial cemetery you will need a sliph scope.
Go east from Saffron or south from lavender until the place where snorlax is sleeping. Then travel further south from that spot (make sure to get rid of snorlax first) until you see a house. Enter and talk to the fisher there. Say you like fishing. he will give you the super rod.
stand in front of snorlax. bring up the pokemon radio and drag the circle thing all the way to the top. It will play Flute music and snorlax will wake up. you then can battle him and catch him if you want. Good Luck!
Slowbro cannot be gotten rid of since its owned by the girl right next to it.