First go to lavender town and go in side the radio tower talk to the man pacing back and
fourth and he will tell you the power in the power plant isnt working go through rock
tunnel and when you get out of it go to the place with 4 cuttable trees (over the
pokecenter) and go to the water and surf till you reach a building go inside and talk to
the fat man on a platform he will tell you the machine is broken as you leave a police man
will tell you about a rocket grunt in cerulean  go to cerulean andyou will find a rocket
grunt he will runon a bridge and will hide talk to him and he will battle you defeat him
and he will tell you about machine parts in the poke gym go to the gym and go and check
the tubes there when you find the machine parts go to the power plant and talk to the fat
man and he will thank you go to lavender town and go inside the radio tower talk to the
man and he will give you a pokefuklte radio station go to the snorlaz and place the
pokeball on the radio at the top then snorlax will wake up and battle you catch him
because this will be the only one youll get try heavy balls.
hope this helped :)